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

int main() {
  int n;
  cin >> n;

  if(n%10 == 7 || (n%100-n%10)/10 == 7 || n/100 == 7) {
    cout << "Yes" << endl;
  } else {
    cout << "No" << endl;
  }

  return 0;
}
