#include <bits/stdc++.h>
using namespace std;

int main() {
  int N;
  cin >> N;
  if (N/100 == 7) cout << "Yes" << endl;
  else if ((N%100)/10 == 7) cout << "Yes" << endl;
  else if (N%10 == 7) cout << "Yes" << endl;
  else cout << "No" << endl;
}
