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

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