#include <bits/stdc++.h>
using namespace std;
#define rep(i,a,n) for (int i=a;i<n;i++)
#define per(i,a,n) for (int i=n-1;i>=a;i--)
#define pb push_back
#define all(x) (x).begin(),(x).end()
#define fi first
#define se second
#define SZ(x) ((int)(x).size())
typedef long long ll;
typedef long double ld;
typedef pair<int, int> ii;
const int mod = (int) 1e9 + 7;
const ll inf = 1LL << 60;
const int maxn = (int) 2e3 + 5;
const ld eps = 1e-9;
int n, a, b, y[maxn], g[maxn];
ll f[maxn][maxn], s[maxn];
void solve2() {
ll res = 0;
per(x, 0, 50) {
rep(i, 1, n + 1) g[i] = mod;
rep(i, 1, n + 1) {
rep(j, 0, i) {
ll val = s[i] - s[j];
if((val | res) < res + (1LL << x)) g[i] = min(g[i], g[j] + 1);
}
}
if(g[n] > b) res |= (1LL << x);
}
cout << res << '\n';
}
int main() {
//freopen("test.txt", "r", stdin);
ios_base::sync_with_stdio(0); cin.tie(0);
cin >> n >> a >> b;
rep(i, 1, n + 1) cin >> y[i], s[i] = s[i - 1] + y[i];
solve2();
}
