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

int main(){
  int n;
  cin >> n;
  
  for(int i = 0; i < 3; ++i){
    if(n % 10 == 7){
      cout << "Yes" << endl;
      return 0;
    }
    n /= 10;
  }
  
  cout << "No" << endl;
}