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

int main(){
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  string s; cin >> s;
  for(int i = 0; i < 3; i++){
    if(s[i] == '7'){
      cout << "Yes" << endl;
      exit(0);
    }
  }
  cout << "No" << endl;
  return 0;
}
