#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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