#include<bits/stdc++.h>
#pragma optimize ("g",on)
#pragma GCC optimize ("inline")
#pragma GCC optimize ("Ofast")
#pragma GCC optimize ("unroll-loops")
#pragma GCC optimize ("03")
#pragma GCC target ("sse,sse2,sse3,ssse3,sse4,popcnt,abm,avx2,mmx,fma,avx,tune=native")
//01001101 01100001 01101011 01101000 01100001 01100111 01100001 01111001
using namespace std;
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define ll long long
#define pb push_back
#define sz(a) a.size()
#define nl '\n'
#define popb pop_back()
#define ld double
#define ull unsigned long long
#define ff first
#define ss second
#define fix fixed << setprecision
#define pii pair<int, int>
#define E exit (0)
#define int long long
const int inf = 1e15, N = 5e3 + 1, mod = 998244353;
double eps = 1e-6;
vector<pii> dir = {{1, 0}, {0, 1}, {-1, 0}, {0, -1}};
main() {
//freopen("F.in", "r", stdin);
//freopen("F.out", "w", stdout);
ios_base::sync_with_stdio(NULL);
cin.tie(NULL);
int n, a, b;
cin >> n >> a >> b;
int y[n], ans = inf;
for (int i = 0; i < n; i++) cin >> y[i];
for (int mask = 0; mask < (1 << (n - 1)); mask++) {
int cnt = __builtin_popcount(mask) + 1;
if (a <= cnt && cnt <= b) {
int cur = 0, val = 0;
for (int i = 0; i < n; i++) {
cur += y[i];
if (mask >> i & 1) {
val |= cur;
cur = 0;
}
}
val |= cur;
ans = min(ans, val);
}
}
cout << ans;
}
