import std.stdio, std.array, std.string, std.conv, std.algorithm;
import std.typecons, std.range, std.random, std.math, std.container;
import std.numeric, std.bigint, core.bitop;

immutable long MOD = 998244353;

void main() {
    auto N = readln.chomp;
    if (N.front == '4' || N.front == '5') {
        writeln("Yes");
    } else {
        writeln("No");
    }
}