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

int main(){
  string s;
  cin >> s;
  for(int i=0; i<3; ++i){
    if(s.at(i) == '7'){
      cout << "Yes" << endl;
      return 0;
    }
  }
  cout << "No" << endl;
  return 0;
}