#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;
}