#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;

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

    return 0;
}