#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ff first
#define ss second
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
#define N 2005
#define INF 0x3f3f3f3f3f3f3f3f
#define MOD 1000000007LL
ll p[N];
int dp1[N];
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int n, a, b;
cin>>n>>a>>b;
ll res = 0;
for(int i = 1; i <= n; i++){
cin>>p[i];
p[i] += p[i - 1];
}
for(int k = 45; k >= 0; k--){
if(a == 1){
memset(dp1, 0x3f, sizeof dp1);
dp1[0] = 0;
} else {
}
for(int i = 1; i <= n; i++){
for(int j = 1; j <= i; j++){
if( (((p[i] - p[j - 1]) >> k ) | (res >> k)) != (res >> k) )
continue;
if(a == 1){
dp1[i] = min(dp1[i], dp1[j - 1] + 1);
} else {
}
}
}
if(a == 1){
if(dp1[n] > b)
res += 1 << k;
} else {
}
}
cout<<res;
}
