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

void fast_io() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
}

int main() {
    fast_io();
    string s;
    cin >> s;
    if (s[0] == '4' || s[0] == '5') {
        cout << "Yes" << endl;
    } else {
        cout << "No" << endl;
    }
}