#include <iostream>
using namespace std;
int main(void) {
  int n;
  cin >> n;
  
  for (int i = 0; i < 3; i++) {
  	if (n % 10 == 7) {
    	cout << "Yes" << endl;
      	return 0;
    }
    n /= 10;
  }
  cout << "No" << endl;
  return 0;
}