#include <bits/stdc++.h>
static struct FASTIO {
char READ_CHARACTER; bool REMAINING_CHARACTER = false;
inline void ignore(); inline void flush();
template <typename T> inline bool READ_INT(T &x); template <typename T> inline bool READ_STRING(T &x);
/* Fast I/O Code Optimizer */
template<size_t N> inline bool READ_CHAR_ARRAY(char (&x)[N]); template<size_t N> inline bool READ_VAR(char (&x)[N]);
/* A tool to optimize execution time of C++ codes by replacing methods of reading and writing variables */
template <typename T> inline bool READ_CHAR(T &x); inline bool READ_CHAR_ARRAY(char*& x); inline bool READ_GETLINE(std::string &x);
/* Use it on fastio.pythonanywhere.com */
template <typename T> inline bool READ_FLOAT(T &x); template <typename T> inline bool READ_DOUBLE(T &x);
/* Github Project: github.com/bfs07/Fast-IO-Code-Optimizer */
template<std::size_t N> inline bool READ_BITSET(std::bitset<N> &bit); template<std::size_t N> inline bool READ_VAR(std::bitset<N> &bit);
inline bool READ_VAR(bool &x); inline bool READ_VAR(short int &x); inline bool READ_VAR(int &x);
inline bool READ_VAR(long int &x); inline bool READ_VAR(long long int &x); inline bool READ_VAR(unsigned short int &x);
inline bool READ_VAR(unsigned int &x); inline bool READ_VAR(unsigned long &x); inline bool READ_VAR(unsigned long long &x);
inline bool READ_VAR(std::string &x); inline bool READ_VAR(char &x); inline bool READ_VAR(char*& x); inline bool READ_VAR(float &x);
inline bool READ_VAR(double &x); inline bool READ_VAR(long double &x); template <typename T> inline void WRITE_INT(T x);
inline void WRITE_STRING(std::string &x); inline void WRITE_CHAR(char x); inline void WRITE_CHAR_ARRAY(const char *x);
inline void WRITE_FLOAT(float x); template <typename T> inline void WRITE_DOUBLE(T x); inline void WRITE_VAR(bool x);
inline void WRITE_VAR(short int x); inline void WRITE_VAR(int x); inline void WRITE_VAR(long int x); inline void WRITE_VAR(long long int x);
inline void WRITE_VAR(unsigned short int x); inline void WRITE_VAR(unsigned int x); inline void WRITE_VAR(unsigned long x);
inline void WRITE_VAR(unsigned long long x); inline void WRITE_VAR(char x); inline void WRITE_VAR(const char *x);
inline void WRITE_VAR(std::string &x); inline void WRITE_VAR(float x); inline void WRITE_VAR(double x); inline void WRITE_VAR(long double x);
template<std::size_t N> inline void WRITE_VAR(std::bitset<N> &bit); template<std::size_t N> inline void WRITE_BITSET(std::bitset<N> &bit);
} __FIO__;
#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("Ofast")
#pragma GCC target("fma,sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
#pragma GCC optimize("unroll-loops")
template<typename T> ostream &operator << (ostream &os, const vector<T> &v) { os << '{'; string sep; for (const auto &x : v) os << sep << x, sep = ", "; return os << '}'; }
template<typename T, size_t size> ostream &operator << (ostream &os, const array<T, size> &arr) { os << '{'; string sep; for (const auto &x : arr) os << sep << x, sep = ", "; return os << '}'; }
template<typename A, typename B> ostream &operator << (ostream &os, const pair<A, B> &p) { return os << '(' << p.first << ", " << p.second << ')'; }
void debug_out() { cerr << endl; }
template<typename Head, typename... Tail> void debug_out(Head H, Tail... T) { cerr << ' ' << H; debug_out(T...); }
#ifdef LOCAL
#define debug(...) cerr << "(" << #__VA_ARGS__ << "):", debug_out(__VA_ARGS__)
#else
#define debug(...) 47
#endif
class SegmentTree {
private:
const int LO, HI;
struct Node {
int mn;
int lazy;
Node () {
mn = 1e9;
lazy = 0;
}
};
vector<Node> seg;
void push(int l, int r, int node) {
if (seg[node].lazy == 0) return;
seg[node].mn += seg[node].lazy;
if (l != r) {
seg[2 * node + 1].lazy += seg[node].lazy;
seg[2 * node + 2].lazy += seg[node].lazy;
}
seg[node].lazy = 0;
}
void modify(int where, int delta, int l, int r, int node) {
push(l, r, node);
if (l > where || r < where) return;
if (l >= where && r <= where) {
seg[node].mn = delta;
return;
}
const int mid = l + (r - l) / 2;
modify(where, delta, l, mid, 2 * node + 1);
modify(where, delta, mid + 1, r, 2 * node + 2);
seg[node].mn = min(seg[2 * node + 1].mn, seg[2 * node + 2].mn);
}
void range_update(int ql, int qr, int delta, int l, int r, int node) {
push(l, r, node);
if (l > qr || r < ql) return;
if (l >= ql && r <= qr) {
seg[node].lazy = delta;
push(l, r, node);
return;
}
const int mid = l + (r - l) / 2;
range_update(ql, qr, delta, l, mid, 2 * node + 1);
range_update(ql, qr, delta, mid + 1, r, 2 * node + 2);
seg[node].mn = min(seg[2 * node + 1].mn, seg[2 * node + 2].mn);
}
int query(int ql, int qr, int l, int r, int node) {
push(l, r, node);
if (l > qr || r < ql) return 1e9;
if (l >= ql && r <= qr) return seg[node].mn;
const int mid = l + (r - l) / 2;
return min(query(ql, qr, l, mid, 2 * node + 1), query(ql, qr, mid + 1, r, 2 * node + 2));
}
public:
SegmentTree(int n) : LO(0), HI(n - 1) {
seg.resize(4 * n);
}
void modify(int where, int delta) {
modify(where, delta, LO, HI, 0);
}
void range_update(int ql, int qr, int delta) {
ql = max(ql, 0);
range_update(ql, qr, delta, LO, HI, 0);
}
int query(int ql, int qr) {
ql = max(ql, 0);
return query(ql, qr, LO, HI, 0);
}
};
const int MAX_N = 1e6 + 5;
vector<vector<int>> g(MAX_N);
int main () {
0;
0;
int n, lo, hi;
__FIO__.READ_VAR(n), __FIO__.READ_VAR(lo), __FIO__.READ_VAR(hi);
vector<int> arr(n + 1);
for (int i = 1; i <= n; i++) __FIO__.READ_VAR(arr[i]);
sort(arr.begin(), arr.end());
vector<int> dp(n + 1);
const int INF = 1e9;
SegmentTree seg_dp(n + 1), seg_val(n + 1);
auto add = [&](int where) {
if (where == n) return;
const int A = dp[where];
const int B = arr[where + 1];
const int CHANGE = B + A + 1;
seg_dp.modify(where, A);
if (CHANGE < MAX_N) g[CHANGE].emplace_back(where);
};
int last_one = 0;
auto update = [&](int delta) {
while(last_one <= delta) {
for (auto where : g[last_one]) {
seg_dp.modify(where, INF);
seg_val.modify(where, delta - arr[where + 1]);
}
++last_one;
}
};
for (int i = 0; i <= n; i++) dp[i] = INF;
dp[0] = 0;
add(0);
for (int i = 1; i <= n; i++) {
if (i > 1) {
const int D = arr[i] - arr[i - 1];
seg_val.range_update(0, i - 1, +D);
}
update(arr[i]);
if (i >= lo){
dp[i] = min(seg_dp.query(i - hi, i - lo), seg_val.query(i - hi, i - lo));
if (dp[i] < INF) add(i);
}
}
__FIO__.WRITE_VAR(dp[n]), __FIO__.WRITE_VAR('\n');
return 0;
}
#undef debug
#undef debug
#undef debug
#undef debug
inline void FASTIO::ignore() {
if(REMAINING_CHARACTER == true) REMAINING_CHARACTER = false; else READ_CHARACTER = getchar();
}
inline void FASTIO::flush() {
fflush(stdout);
}
// cin modifications
template <typename T>
inline bool FASTIO::READ_INT(T &x) {
x = 0; T sig = 1;
if(!REMAINING_CHARACTER) READ_CHARACTER = getchar(), REMAINING_CHARACTER = true; else REMAINING_CHARACTER = false;
while (!isdigit(READ_CHARACTER) && READ_CHARACTER != EOF) sig = (READ_CHARACTER == '-' ? -sig : sig), READ_CHARACTER = getchar();
if(READ_CHARACTER == EOF) return REMAINING_CHARACTER = false, false;
while (isdigit(READ_CHARACTER)) x = x * 10 + READ_CHARACTER - '0', READ_CHARACTER = getchar();
x *= sig; REMAINING_CHARACTER = true;
return true;
}
template <typename T>
inline bool FASTIO::READ_STRING(T &x) {
x = "";
if(!REMAINING_CHARACTER) READ_CHARACTER = getchar(), REMAINING_CHARACTER = true; else REMAINING_CHARACTER = false;
while ((READ_CHARACTER == '\n' || READ_CHARACTER == '\t' || READ_CHARACTER == ' ')) READ_CHARACTER = getchar();
if(READ_CHARACTER == EOF) return REMAINING_CHARACTER = false, false;
while ((READ_CHARACTER != '\n' && READ_CHARACTER != '\t' && READ_CHARACTER != ' ' && READ_CHARACTER != EOF)) x += READ_CHARACTER, READ_CHARACTER = getchar();
REMAINING_CHARACTER = true;
return true;
}
inline bool FASTIO::READ_GETLINE(std::string &x) {
x = "";
if(!REMAINING_CHARACTER) READ_CHARACTER = getchar(), REMAINING_CHARACTER = true; else REMAINING_CHARACTER = false;
if(READ_CHARACTER == EOF) return REMAINING_CHARACTER = false, false;
while ((READ_CHARACTER != '\n' && READ_CHARACTER != EOF)) x += READ_CHARACTER, READ_CHARACTER = getchar();
REMAINING_CHARACTER = false;
return true;
}
template <typename T>
inline bool FASTIO::READ_CHAR(T &x) {
if(!REMAINING_CHARACTER) READ_CHARACTER = getchar(), REMAINING_CHARACTER = true; else REMAINING_CHARACTER = false;
if(READ_CHARACTER == EOF) return REMAINING_CHARACTER = false, false;
while ((READ_CHARACTER == '\n' || READ_CHARACTER == '\t' || READ_CHARACTER == ' ')) READ_CHARACTER = getchar();
x = READ_CHARACTER; REMAINING_CHARACTER = false;
return true;
}
template<size_t N>
inline bool FASTIO::READ_CHAR_ARRAY(char (&x)[N]) {
if(!REMAINING_CHARACTER) READ_CHARACTER = getchar(), REMAINING_CHARACTER = true; else REMAINING_CHARACTER = false;
while ((READ_CHARACTER == '\n' || READ_CHARACTER == '\t' || READ_CHARACTER == ' ')) READ_CHARACTER = getchar();
if(READ_CHARACTER == EOF) return REMAINING_CHARACTER = false, false;
char *ptr = &x[0];
while ((READ_CHARACTER != '\n' && READ_CHARACTER != '\t' && READ_CHARACTER != ' ' && READ_CHARACTER != EOF)) *ptr++ = READ_CHARACTER, READ_CHARACTER = getchar();
*ptr = '\0', REMAINING_CHARACTER = true;
return true;
}
inline bool FASTIO::READ_CHAR_ARRAY(char*& x) {
std::string y;
if(READ_STRING(y) == false)
return false;
x = new char[(int)y.size() + 1];
strcpy(x, y.c_str());
return true;
}
template <typename T>
inline bool FASTIO::READ_FLOAT(T &x) {
return (scanf("%f", &x) != EOF);
}
template <typename T>
inline bool FASTIO::READ_DOUBLE(T &x) {
double y;
if(scanf("%lf", &y) == EOF) return false;
x = y;
return true;
}
template<std::size_t N>
inline bool FASTIO::READ_BITSET(std::bitset<N> &x) {
if(!REMAINING_CHARACTER) READ_CHARACTER = getchar(), REMAINING_CHARACTER = true; else REMAINING_CHARACTER = false;
while ((READ_CHARACTER == '\n' || READ_CHARACTER == '\t' || READ_CHARACTER == ' ')) READ_CHARACTER = getchar();
if(READ_CHARACTER == EOF) return REMAINING_CHARACTER = false, false;
int i = 0; REMAINING_CHARACTER = true;
while (READ_CHARACTER == '0' || READ_CHARACTER == '1') x[i++] = READ_CHARACTER - '0', READ_CHARACTER = getchar();
return true;
}
inline bool FASTIO::READ_VAR(short int &x) {
return READ_INT(x);
}
inline bool FASTIO::READ_VAR(int &x) {
return READ_INT(x);
}
inline bool FASTIO::READ_VAR(long int &x) {
return READ_INT(x);
}
inline bool FASTIO::READ_VAR(long long int &x) {
return READ_INT(x);
}
inline bool FASTIO::READ_VAR(unsigned short int &x) {
return READ_INT(x);
}
inline bool FASTIO::READ_VAR(unsigned int &x) {
return READ_INT(x);
}
inline bool FASTIO::READ_VAR(unsigned long &x) {
return READ_INT(x);
}
inline bool FASTIO::READ_VAR(unsigned long long &x) {
return READ_INT(x);
}
inline bool FASTIO::READ_VAR(std::string &x) {
return READ_STRING(x);
}
inline bool FASTIO::READ_VAR(char &x) {
return READ_CHAR(x);
}
template<size_t N>
inline bool FASTIO::READ_VAR(char (&x)[N]) {
return READ_CHAR_ARRAY(x);
}
inline bool FASTIO::READ_VAR(char*& x) {
return READ_CHAR_ARRAY(x);
}
inline bool FASTIO::READ_VAR(float &x) {
return READ_FLOAT(x);
}
inline bool FASTIO::READ_VAR(double &x) {
return READ_DOUBLE(x);
}
inline bool FASTIO::READ_VAR(long double &x) {
return READ_DOUBLE(x);
}
template<std::size_t N>
inline bool FASTIO::READ_VAR(std::bitset<N> &x) {
return READ_BITSET(x);
}
// cout modifications
template <typename T>
inline void FASTIO::WRITE_INT(T x) {
if (x < 0) {putchar('-'); x = -x; }
char writeBuffer[20], *writePtr = writeBuffer;
do {
*writePtr++ = '0' + x % 10;
x /= 10;
}
while (x);
do { putchar(*--writePtr); }
while (writePtr > writeBuffer);
}
inline void FASTIO::WRITE_CHAR(char x) {
putchar(x);
}
inline void FASTIO::WRITE_CHAR_ARRAY(const char *x) {
while(*x != '\0')
putchar(*x++);
}
inline void FASTIO::WRITE_STRING(std::string &x) {
for(char c: x)
putchar(c);
}
inline void FASTIO::WRITE_FLOAT(float x) {
printf("%f", x);
}
template <typename T>
inline void FASTIO::WRITE_DOUBLE(T x) {
printf("%lf", (double)x);
}
template<std::size_t N>
inline void FASTIO::WRITE_BITSET(std::bitset<N> &x) {
for(int i = (int)x.size() - 1; i >= 0; i--)
putchar(x[i] + 48);
}
inline void FASTIO::WRITE_VAR(bool x) {
WRITE_INT(x);
}
inline void FASTIO::WRITE_VAR(short int x) {
WRITE_INT(x);
}
inline void FASTIO::WRITE_VAR(int x) {
WRITE_INT(x);
}
inline void FASTIO::WRITE_VAR(long int x) {
WRITE_INT(x);
}
inline void FASTIO::WRITE_VAR(long long int x) {
WRITE_INT(x);
}
inline void FASTIO::WRITE_VAR(unsigned short int x) {
WRITE_INT(x);
}
inline void FASTIO::WRITE_VAR(unsigned int x) {
WRITE_INT(x);
}
inline void FASTIO::WRITE_VAR(unsigned long x) {
WRITE_INT(x);
}
inline void FASTIO::WRITE_VAR(unsigned long long x) {
WRITE_INT(x);
}
inline void FASTIO::WRITE_VAR(std::string &x) {
WRITE_STRING(x);
}
inline void FASTIO::WRITE_VAR(char x) {
WRITE_CHAR(x);
}
inline void FASTIO::WRITE_VAR(const char *x) {
WRITE_CHAR_ARRAY(x);
}
inline void FASTIO::WRITE_VAR(float x) {
WRITE_FLOAT(x);
}
inline void FASTIO::WRITE_VAR(double x) {
WRITE_DOUBLE(x);
}
inline void FASTIO::WRITE_VAR(long double x) {
WRITE_DOUBLE(x);
}
template<std::size_t N>
inline void FASTIO::WRITE_VAR(std::bitset<N> &x) {
WRITE_BITSET(x);
}
