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

int main() {
  int N;
  cin >> N;
  int a=N/100;
  int b=N%100/10;
  int c=N%100%10;
  
  if (a==7 || b==7 || c==7 )
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
}