#include <iostream>
using namespace std;

int main(){
  int n;
  cin >> n;
  bool flag = false;
  for (int i = 0; i < 3; i++){
    if (n % 10 == 7){
      flag = true;
      break;
    }
    n /= 10;
  }
  if (flag)
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
  
  return 0;
}