#include <bits/stdc++.h>
using namespace std;
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int n, A, B;
cin >> n >> A >> B;
vector<int> a(n);
for (int i = 0; i < n; i++) {
cin >> a[i];
}
int64_t ans = LLONG_MAX;
for (int x = A; x <= B; x++) {
for (int mask = 0; mask < (1 << n); mask++) {
if (__builtin_popcount(mask) != x - 1 || mask >> (n - 1) & 1) continue;
int64_t sum = 0, OR = 0;
for (int i = 0; i < n; i++) {
sum += a[i];
if (mask >> i & 1) {
OR |= sum;
sum = 0;
}
}
OR |= sum;
ans = min(ans, OR);
}
}
cout << ans << '\n';
return 0;
}
