#include <bits/stdc++.h>
// #include <ext/rope>
// #include <ext/pb_ds/assoc_container.hpp>
// using namespace __gnu_pbds;
// using namespace __gnu_cxx;
using namespace std;
// #define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
#define ll long long
#define ull unsigned long long
#define ld long double
#define pb push_back
#define bit(mask, i) ((mask >> i) & 1)
#define el '\n'
#define F first
#define S second
template <class X, class Y> bool maximize(X &x, const Y &y) { return (x < y ? x = y, 1 : 0); }
template <class X, class Y> bool minimize(X &x, const Y &y) { return (x > y ? x = y, 1 : 0); }
const int INF = 1e9;
const ll LINF = 1e18;
const int MOD = 1e9 + 7;
const int MULTI = 0;
const ld eps = 1e-9;
const int dx[4] = {0, 1, 0, -1}, dy[4] = {1, 0, -1, 0}; // R D L U
const int ddx[4] = {-1, 1, 1, -1}, ddy[4] = {1, 1, -1, -1}; // UR DR DL UL
const char cx[4] = {'R', 'D', 'L', 'U'};
const ll base = 31;
const int nMOD = 2;
const ll mods[] = {(ll)1e9 + 10777, (ll)1e9 + 19777, (ll)1e9 + 3, (ll)1e9 + 3777};
const int N = 2e3 + 5;
const int LOG = 40;
int n, a, b, y[N];
ll pref[N];
namespace four {
const int N = 1e2 + 5;
bool dp[N][N];
void solve() {
ll mask = 0, res = 0;
for (int t = LOG; t >= 0; --t) {
mask |= (1LL << t);
memset(dp, 0, sizeof(dp));
dp[0][0] = 1;
for (int i = 1; i <= n; ++i)
for (int j = 1; j <= n; ++j)
for (int k = 0; k < i; ++k)
if (((pref[i] - pref[k]) & mask) == 0)
dp[i][j] |= dp[k][j - 1];
bool c = 0;
for (int i = a; i <= b; ++i)
if (dp[n][i])
c = 1;
if (!c) mask ^= (1LL << t), res |= (1LL << t);
}
cout << res;
}
}
namespace five {
int dp[N];
void solve() {
ll mask = 0, res = 0;
for (int t = LOG; t >= 0; --t) {
mask |= (1LL << t);
memset(dp, 0x3f, sizeof(dp));
dp[0] = 0;
for (int i = 1; i <= n; ++i)
for (int j = 0; j < i; ++j)
if (((pref[i] - pref[j]) & mask) == 0)
minimize(dp[i], dp[j] + 1);
if (dp[n] > b) mask ^= (1LL << t), res |= (1LL << t);
}
cout << res;
}
}
signed main() {
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
cin >> n >> a >> b;
for (int i = 1; i <= n; ++i)
cin >> y[i];
for (int i = 1; i <= n; ++i)
pref[i] = pref[i - 1] + y[i];
if (a != 1) return four::solve(), 0;
five::solve();
return 0;
}
