#include <iostream>
using namespace std;
int main() {
	int n;
    cin >> n;
  	if(n / 100 == 7 || n % 10 == 7 || ((n / 10) % 10) == 7)
      	cout << "Yes" << endl;
  	else
      	cout << "No" << endl;
  	return 0;
}