#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)

int main() {
	string s;
	std::cin >> s;
	if (s.at(0)=='4'||s.at(0)=='5') {
		std::cout << "Yes" << '\n';
	} else std::cout << "No" << '\n';


}