#include<bits/stdc++.h>
using namespace std;
const long long inf = (long long) 1e18 + 10;
const int inf1 = (int) 1e9 + 10;
#define int long long
#define dbl long double
#define endl '\n'
#define sc second
#define fr first
#define mp make_pair
#define pb push_back
#define all(x) x.begin(), x.end()
const int maxn = 550;
int n, d, T, t[maxn], r[maxn], qtd[maxn], trT[4*maxn], lzqtd[4*maxn];
set<pair<int,int>> st;
pair<int,int> trqtd[4*maxn];
void buildT(int no, int l, int r) {
trT[no] = inf;
if(l != r) {
int f1=2*no;
int f2=2*no+1;
int mid = (l+r)>>1;
buildT(f1,l,mid);
buildT(f2,mid+1,r);
}
}
void attT(int no, int l, int r, int pos, int val) {
if(l > pos || r < pos) return;
if(l == r) {
trT[no] = val;
return;
}
int f1=2*no;
int f2=2*no+1;
int mid = (l+r)>>1;
attT(f1,l,mid,pos,val);
attT(f2,mid+1,r,pos,val);
trT[no] = min(trT[f1],trT[f2]);
}
int findT(int no, int l, int r, int val) {
if(l == r) return l;
int f1 = 2*no;
int f2 = 2*no+1;
int mid = (l+r)/2;
if(trT[f2] <= val) return findT(f2,mid+1,r,val);
return findT(f1,l,mid,val);
}
void buildqtd(int no, int l, int r) {
if(l == r) {
trqtd[no] = mp(0,l);
return;
}
int f1=2*no;
int f2=2*no+1;
int mid = (l+r)>>1;
buildqtd(f1,l,mid);
buildqtd(f2,mid+1,r);
trqtd[no] = max(trqtd[f1],trqtd[f2]);
}
void flushqtd(int no, int l, int r) {
trqtd[no].fr+= lzqtd[no];
if(l != r) {
int f1=2*no;
int f2=2*no+1;
int mid = (l+r)>>1;
lzqtd[f1]+=lzqtd[no];
lzqtd[f2]+=lzqtd[no];
}
lzqtd[no] = 0;
}
//quero pegar o cara com maior qtd em cada momento
void attqtd(int no, int l, int r, int L, int R, int val) {
flushqtd(no,l,r);
if(l > R || r < L) return;
if(l >= L && r <= R) {
lzqtd[no] = val;
flushqtd(no,l,r);
return;
}
int f1=2*no;
int f2=2*no+1;
int mid = (l+r)>>1;
attqtd(f1,l,mid,L,R,val);
attqtd(f2,mid+1,r,L,R,val);
trqtd[no] = max(trqtd[f1],trqtd[f2]);
}
void solve() {
cin >> n >> d >> T;
d = min(d,n-1);
int ans = 0;
for(int i = 1; i <= n; i++) cin >> t[i];
buildT(1,1,n);
buildqtd(1,1,n);
for(int i = 1; i <= n; i++) {
attT(1,1,n,i,t[i]-i);
if(trT[1] > T-i) {
r[i] = n+1;
}
else {
r[i] = findT(1,1,n,T-i);
}
if(r[i]!=n+1) ans++;
//i aumenta o qtd de r[i] até i-1
if(r[i] != i && r[i] != n+1) {
attqtd(1,1,n,r[i],i-1,+1);
}
// cout << i << " " << r[i] << endl;
}
//qtd[i] -> qtd de retas passando de i+1 pra i
for(int i = 1; i < n; i++) {
qtd[i] = 0;
for(int j = i+1; j <= n; j++) {
if(r[j] != 0 && r[j] <= i) qtd[i]++;
}
st.insert(mp(qtd[i],i));
// cout << i << " - " << qtd[i] << endl;
}
while(d--) {
// auto it = st.end(); it--;
// int id = it->sc;
// st.erase(it);
flushqtd(1,1,n);
int id = trqtd[1].sc;
//tira todos os j que tem r[j] <= id
for(int j = id+1; j <= n; j++) {
if(r[j] != n+1 && r[j] <= id) {
//diminui a qtd dos que ele tinha aumentado
// for(int i = r[j]; i < j; i++) {
// st.erase(mp(qtd[i],i));
// qtd[i]--;
// st.insert(mp(qtd[i],i));
// }
if(r[j] != j) {
attqtd(1,1,n,r[j],j-1,-1);
}
r[j] = n+1;
ans--;
}
}
}
cout << ans << endl;
}
int32_t main() {
ios::sync_with_stdio(false); cin.tie(0);
// freopen("in.in", "r", stdin);
// freopen("out.out", "w", stdout);
int tt = 1;
// cin >> tt;
while(tt--) {
solve();
}
}
