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

int main() {
  string N; cin >> N;
  
  bool seven = false;
  for (int i = 0; i < 3; i++) {
    if (N[i] == '7') seven = true;
  }
  
  if (seven) cout << "Yes" << endl;
  else cout << "No" << endl;
}