#include <bits/stdc++.h>
using namespace std;
 
int main() {
  int N;
  cin >> N;
 
  if (N/100 >= 7 && N/100 <8) {
    cout << "Yes" << endl;
  }
  else if (N%100/10 >= 7 && N%100/10 <8){
    cout << "Yes" << endl;
  }
  else if (N%100%10 >= 7 && N%100%10 <8){
    cout << "Yes" << endl;
  }
  else  {
    cout << "No" << endl;
  }
}