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

int main()
{
  int n;
  cin >> n;
  while(n)
  {
    if(n % 10 == 7)
    {
      cout << "Yes";
      return 0;
    }
    n /= 10;
  }
  cout << "No";
  return 0;
}