#include<iostream>
using namespace std;
int main()
{
  int n, a, b, c;
  cin >> n;
  a = n / 100;
  b = (n / 10) % 10;
  c = n % 10;
  if(a == 7 || b == 7 || c == 7)
  cout << "Yes";
  else
    cout << "No";
  return 0;
}