#include <bits/stdc++.h>

using namespace std;


int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.precision(10);
    cout << fixed;

    int x;
    cin >> x;

    if (x > 0 && (2*x) <= 100){
        cout << "YES" << endl;
    } else {
        cout << "NO" << endl;
    }


    return 0;
}