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

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

    return 0;
}