#include <bits/stdc++.h>
using namespace std;
#define int long long
const int inf = 1e9;
signed main(){
ios::sync_with_stdio(0);
cin.tie(nullptr); cout.tie(nullptr);
int n, a, b, s = 0, xo = 0;
cin >> n >> a >> b;
vector<int> ar(n + 1, 0);
for(int i = 1, cur = 0; i <= n; ++i){
cin >> ar[i];
cur += 1;
s += ar[i];
if(cur == b){
xo |= s;
s = 0;
cur = 0;
}
}
cout << xo << "\n";
return 0;
}
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