#include <bits/stdc++.h>
using namespace std;
#define int long long
mt19937_64 RNG(chrono::steady_clock::now().time_since_epoch().count());
const int N = 2010, INF = 1e15;
int arr[N];
int n, a, b;
int Check(int val) {
//cout << "val = " << val << "\n";
int dp[n + 2][b + 1];
for(int i = 0; i <= n + 1; i++) {
for(int j = 0; j <= b; j++) {
dp[i][j] = 0;
}
}
dp[1][0] = 1;
for(int i = 1; i <= n; i++) {
for(int j = 0; j < b; j++) {
if(dp[i][j] == 0) {
continue;
}
/*if(val == 9) {
cout << "i = " << i << ", j = " << j << ", dp[i][j] has been deemed true\n";
}*/
for(int k = i; k <= n; k++) {
int tot = arr[k] - arr[i - 1];
if((val ^ tot) == (val - tot)) {
dp[k + 1][j + 1] = 1;
/*if(val == 9) {
cout << "dp[i][j] goes to dp[" << k + 1 << "][" << j + 1 << "]\n";
}*/
}
}
}
}
/*if(val == 9) {
for(int i = 1; i <= n + 1; i++) {
for(int j = 0; j <= b; j++) {
cout << dp[i][j] << " ";
}
cout << "\n";
}
}*/
for(int i = a; i <= b; i++) {
if(dp[n + 1][i] == 1) {
return 1;
}
}
return 0;
}
int Check2(int val) {
int dp[n + 2];
for(int i = 0; i <= n + 1; i++) {
dp[i] = INF;
}
dp[1] = 0;
for(int i = 1; i < n + 1; i++) {
for(int j = i + 1; j <= n + 1; j++) {
int sum = arr[j - 1] - arr[i - 1];
//cout << "i = " << i << ", j = " << j << ", sum = " << sum << "\n";
if((val ^ sum) == (val - sum)) {
dp[j] = min(dp[j], dp[i] + 1);
}
}
}
/*for(int i = 0; i <= n + 1; i++) {
cout << dp[i] << " ";
}
cout << "\n";*/
if(dp[n + 1] <= b) {
return 1;
}
return 0;
}
void Solve() {
cin >> n >> a >> b;
arr[0] = 0;
for(int i = 1; i <= n; i++) {
cin >> arr[i];
arr[i] += arr[i - 1];
}
int ans = (1LL << 50) - 1;
for(int i = 49; i >= 0; i--) {
//cout << "i = " << i << "\n";
//cout << "ans = " << ans << "\n";
//cout << " ";
ans ^= (1LL << i);
if(a >= 2 && Check(ans) == 0) {
ans ^= (1LL << i);
}
else if(a < 2 && Check2(ans) == 0) {
ans ^= (1LL << i);
}
//cout << "Finally, answer = " << ans << "\n";
}
//cout << " ";
cout << ans << "\n";
}
int32_t main() {
auto begin = std::chrono::high_resolution_clock::now();
ios_base::sync_with_stdio(0);
cin.tie(0);
int t = 1;
//cin >> t;
while(t--) {
Solve();
}
auto end = std::chrono::high_resolution_clock::now();
auto elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(end - begin);
cerr << "Time measured: " << elapsed.count() * 1e-9 << " seconds.\n";
return 0;
}
