#include <bits/stdc++.h>
#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define FORd(i, a, b) for (int i = (a); i >= (b); i--)
#define REP(i, n) FOR(i, 0, n)
#define ll long long
using namespace std;
const int MAXN = 2010;
ll arr[MAXN], pref[MAXN];
int n, a, b;
ll dp[MAXN], out = 0;
ll val(ll sum) {
return ((((1LL << 60) - 1) - out) & sum);
}
int solve(int x) {
REP(i, n) {
dp[i] = 1e9;
if (val(pref[i]) < (1LL << x)) dp[i] = 1;
REP(j, i) {
if (val(pref[i] - pref[j]) < (1LL << x)) dp[i] = min(dp[i], dp[j] + 1);
}
}
return dp[n - 1];
}
int main() {
ios_base::sync_with_stdio(false);
cin >> n >> a >> b;
REP(i, n) cin >> arr[i];
REP(i, n) {
pref[i] = arr[i];
if (i) pref[i] += pref[i - 1];
}
FORd(i, 50, 0) {
if (solve(i) > b) out |= (1LL << i);
}
cout << out << endl;
return 0;
}
