#include <bits/stdc++.h>
#define pb push_back
#define eb emplace_back
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define uniq(x) x.erase(unique(all(x)), x.end())
#define rall(x) x.rbegin(), x.rend()
//#define int long long
using namespace std;
using ll = long long;
using ull = unsigned long long;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
const int mod = 1e9 + 7;
const int LOG = 20;
const int maxn = 1e5 + 5;
const double eps = 1e-9;
void setIO() {
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
}
int N, A, B;
ll ans = 1e18;
vector<int> v;
void f(int pos, ll res, int groups) {
if(pos == N + 1 && A <= groups && groups <= B) {
ans = min(ans, res);
return ;
}
ll sum = 0;
for(int i=pos; i<=N; i++) {
sum += v[i];
f(i+1, res | sum, groups + 1);
}
}
int32_t main() {
setIO();
cin >> N >> A >> B;
v.resize(N+1);
for(int i=1; i<=N; i++) cin >> v[i];
f(1, 0, 0);
cout << ans << '\n';
return 0;
}
