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

int main() {
  string N;
  cin >> N;

  if (N.at(0) == '7' || N.at(1) =='7' || N.at(2) == '7') {
    cout << "Yes" << endl;
  }
  else {
    cout << "No" << endl;
  }
}