// subtask 1
#include "bits/stdc++.h"
#define sz(x) (int)size(x)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
using namespace std;
using ll = long long;
using pii = pair<int, int>;
const char nl = '\n';
const int INF = 0x3f3f3f3f;
const ll LINF = 0x3f3f3f3f3f3f3f3f;
int32_t main() {
ios::sync_with_stdio(0), cin.tie(0);
int n, a, b; cin >> n >> a >> b;
vector<int> y(n); for (auto &x : y) cin >> x;
ll ans = LINF;
for (int mask = 0; mask < (1 << (n - 1)); mask++) {
ll or_sum = 0, cur_sum = 0;
for (int i = 0; i < n; i++) {
cur_sum += y[i];
if (mask & (1 << i)) {
or_sum |= cur_sum;
cur_sum = 0;
}
}
or_sum |= cur_sum;
int cnt = __builtin_popcount(mask) + 1;
if (a <= cnt && cnt <= b)
ans = min(ans, or_sum);
}
cout << ans << nl;
return 0;
}
