/*
Code written by Talant I.D.
*/
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;
#define precision(n) fixed << setprecision(n)
#define pb push_back
#define ub upper_bound
#define lb lower_bound
#define mp make_pair
#define eps (double)1e-9
#define PI 2*acos(0.0)
#define endl "\n"
#define sz(v) int((v).size())
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
#define do_not_disturb ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define OK cout << "OK" << endl;
const int mod = 1e9+7;
ll mode(ll a) {
a %= mod;
if (a < 0) a += mod;
return a;
}
ll subt(ll a, ll b) {
return mode(mode(a)-mode(b));
}
ll add(ll a, ll b) {
return mode(mode(a)+mode(b));
}
ll mult(ll a, ll b) {
return mode(mode(a)*mode(b));
}
ll binpow(ll a, ll b) {
ll res = 1;
while (b) {
if (b&1) res = mult(res, a);
a = mult(a, a);
b >>= 1;
}
return res;
}
int main() {
do_not_disturb
int n, a, b;
cin >> n >> a >> b;
vector <ll> v(n+1), pref(n+1);
for (int i = 1; i <= n; i++) cin >> v[i];
for (int i = 1; i <= n; i++) pref[i] = pref[i-1]+v[i];
if (n <= 20) {
ll ans = 9e18;
for (int mask = 0; mask < (1<<n); mask++) {
ll prev = 1, j = 1, cnt = 0, sum = 0;
while (j <= n) {
while (j <= n && !(mask&(1<<(j-1)))) {
j++;
}
if (prev < j) {
cnt++;
sum |= pref[j-1]-pref[prev-1];
}
prev = j;
j++;
}
if (prev == n) {
sum |= v[n];
cnt++;
}
if (a <= cnt && cnt <= b) {
ans = min(ans, sum);
}
}
cout << ans;
}
else if (n <= 50 && a >= 1) {
bool dp[53][53][53];
memset(dp, false, sizeof(dp));
dp[0][0][0] = 1;
for (int i = 1; i <= n; i++) {
dp[i][pref[i]][1] = 1;
}
for (int par = 2; par <= n; par++) {
for (int i = 1; i <= n; i++) {
for (int orr = 0; orr <= 50; orr++) {
for (int j = i-1; j >= par-1; j--) {
dp[i][orr|(pref[i]-pref[j])][par] |= dp[j][orr][par-1];
}
}
}
}
int ans = 2e9;
for (int par = a; par <= b; par++) {
for (int orr = 0; orr <= 50; orr++) {
if (dp[n][orr][par]) ans = min(ans, orr);
}
}
cout << ans;
}
else if (n <= 100 && a == 1) {
}
else if (n <= 100) {
}
else {
}
return 0;
}
