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

int main() {
  string N;
  cin >> N;
  
  if (S.at(0) == 7 || S.at(1) == 7 || S.at(2) == 7) {
    cout << "Yes" << endl;
  }
  else {
    cout << "No" << endl;
  }
  }
}
