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

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