#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int main(){
ios_base::sync_with_stdio(false);
cin.tie(0); cout.tie(0);
int nums, a, b; cin >> nums >> a >> b;
vector<ll> pref(nums + 1);
for (int i = 1; i <= nums; i++){
ll x; cin >> x;
pref[i] = pref[i - 1] + x;
}
ll ans = (1ll << 60) - 1;
for (int bit = 59; bit >= 0; bit--){
ll targ = ans - (1ll << bit);
bool dp[105][105];
memset(dp, 0, sizeof(dp));
dp[0][0] = 1;
for (int i = 1; i <= nums; i++)
for (int j = 1; j <= i; j++)
for (int k = 0; k < i; k++){
ll sum = pref[i] - pref[k];
if ((sum & targ) == sum) dp[i][j] |= dp[k][j - 1];
}
bool ok = 0;
for (int j = a; j <= b; j++)
if (dp[nums][j])
ok = 1;
if (ok) ans = targ;
}
cout << ans;
return 0;
}
