#include <bits/stdc++.h>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <time.h>
#include <limits.h>
using namespace std;
typedef long long ll;
typedef double lf;
const int N_ = 2050;
int N, A, B;
ll S[N_];
ll ans;
bool tb1[105][105];
void solve1() {
ans = 0;
ll cur = 0;
for(int b = 41; b >= 0; b--) {
ll t = cur | (1ll << b);
tb1[0][0] = true;
for(int i = 1; i <= N; i++) for(int x = 1; x <= i; x++) {
tb1[i][x] = false;
for(int j = 0; j < i; j++) {
ll s = S[i] - S[j];
if((s & t) == 0) tb1[i][x] |= tb1[j][x - 1];
}
}
bool good = false;
for(int x = A; x <= B; x++) good |= tb1[N][x];
if(good) {
cur = t;
}else {
ans += 1ll << b;
}
}
}
int tb2[N_];
void solve2() {
ans = 0;
ll cur = 0;
for(int b = 41; b >= 0; b--) {
ll t = cur | (1ll << b);
for(int i = 1; i <= N; i++) {
tb2[i] = (int)1e6;
for(int j = 0; j < i; j++) {
ll s = S[i] - S[j];
if((s & t) == 0) tb2[i] = min(tb2[i], tb2[j] + 1);
}
}
//printf("%lld %lld %d\n", ans, 1ll<<b, tb2[N]);
if(tb2[N] <= B) {
cur = t;
}else {
ans += 1ll << b;
}
}
}
int main() {
//freopen("input.txt", "r", stdin);
//freopen("output.txt", "w", stdout);
scanf("%d%d%d", &N, &A, &B);
for(int i = 1; i <= N; i++) {
int x; scanf("%d", &x);
S[i] = S[i-1] + x;
}
if(N <= 100) {
solve1();
}else {
solve2();
}
printf("%lld\n", ans);
return 0;
}
