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

int main(){
    string s;
    cin >> s;

    if(s[0] == '4' || s[0] == '5') cout << "Yes" << endl;
    else cout << "No" << endl;

    return 0;
}