// subtask 2
#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;
template<typename T>
void chmin(T &a, T b) { if (b < a) a = b; }
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;
vector<ll> p(n); p[0] = y[0];
for (int i = 1; i < n; i++)
p[i] = p[i - 1] + y[i];
vector dp(n, vector<ll>(b + 1, LINF));
dp[0][1] = y[0];
for (int i = 1; i < n; i++)
for (int k = 1; k <= b; k++)
for (int j = 0; j < i; j++)
chmin(dp[i][k], dp[j][k - 1] | (p[i] - p[j]));
ll ans = LINF;
for (int i = a; i <= b; i++)
chmin(ans, dp[n - 1][i]);
cout << ans << nl;
return 0;
}
