#include "bits/stdc++.h"
using namespace std;
#define int long long
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define ss second
#define ff first
#define pb push_back
void solve(){
int n; cin >> n;
int N = (1ll << n);
vector<int> v(N);
for(int i = 0; i < N; i++) cin >> v[i];
cout << 0;
}
signed main() {
cin.tie(nullptr)->sync_with_stdio(false);
int t = 1; //cin >> t;
while(t--){
solve();
cout << endl;
}
return 0;
}
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