#include <iostream>
using namespace std;

int main(){
  int N;
  int a,b,c
  cin >> N;
  a = N%10;
  b = (N/10)%10;
  c = N/100;
  if (a==7 || b==7 || c==7){
    cout << "Yes" << endl;
  } else {
    cout << "No" << endl;
  }
  return 0;
}