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

int main() {
  string N;
  cin >> N;
  
  if(N.at(0) == '7' || N.at(1) == '7' ||N.at(2) == '7'){
    cout << "Yes" << endl;
  }
  else{
    cout << "No" << endl;
  }
  
  
}
