#include <bits/stdc++.h>
using namespace std;

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