#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <bits/stdc++.h>
#define fi first
#define se second
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define ff(i,a,b) for(int i=a;i<=b;i++)
#define fb(i,b,a) for(int i=b;i>=a;i--)
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef pair<int,int> pii;
const int maxn = 2005;
const int inf = 1e9 + 5;
template<typename T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
// os.order_of_key(k) the number of elements in the os less than k
// *os.find_by_order(k) print the k-th smallest number in os(0-based)
int n, A, B;
ll niz[maxn];
bool dp[maxn][maxn];
bool da_li(ll X) {
memset(dp, 0, sizeof(dp));
dp[0][0] = 1;
ff(i,1,n) {
ff(j,1,B) {
ll zbir = 0;
fb(l,i,1) {
zbir += niz[l];
if(!(zbir & (~X)))dp[i][j] |= dp[l - 1][j - 1];
}
}
}
ff(i,A,B) {
if(dp[n][i] == 1)return 1;
}
return 0;
}
int main()
{
ios::sync_with_stdio(false);
cout.tie(nullptr);
cin.tie(nullptr);
cin >> n >> A >> B;
ff(i,1,n)cin >> niz[i];
ll rez = (1ll << 41) - 1;
fb(mask,40,0) {
if(da_li(rez ^ (1ll << mask)))rez ^= (1ll << mask);
}
cout << rez << endl;
return 0;
}
/**
6 1 3
8 1 2 1 5 4
// probati bojenje sahovski ili slicno
**/
