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

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