#include <bits/stdc++.h>
using namespace std;
int main(){
  string N;
  cin >> N;
  for (int i=0; i<3; i++){
    if (N.at(i) == '7'){
      cout << "Yes"s;
      goto N;
    }
  }
  cout << "No"s;
N:
  cout << endl;
}
   