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


int main(){
  int N;

  cin >> N;
  if(N % 10 == 7 || (N % 100) / 10 == 7 || N / 100 == 7){
    cout << "Yes" << endl;
  }else{
    cout << "No" << endl;
  }
  return 0;
}
