#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  bool B;
  cin >> n;
  vector<int> v;
  for (int i = 0; i < (n + 1); ++i) {
    cin >> i;
    v.push_back(i);
  }
  cout << "No" << endl;
}
