#include <bits/stdc++.h>
using namespace std;
int N;
int main() {
  cin >> N;
  if (N / 100 == 7 || N % 100 / 10 == 7 || N % 10 == 7) {
    cout << "Yes\n";
  } else {
    cout << "No\n";
  }
  return 0;
}
