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

int main() {
  cin >> n;
  if (n % 10 == 7 || (n / 10) % 10 == 7 || (n / 100) % 10 == 7 ) {
    cout << "Yes";
  } else {
     cout << "No";
  }
}