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

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