#include <bits/stdc++.h>

using namespace std;

int main() {
    int a, b, c;
    cin >> a >> b >> c;
    if ((a + c - 1) / c <= (a + b - 1) / b * 2 / 3) {
        cout << "YES" << endl;
    } else {
        cout << "NO" << endl;
    }
    return 0;
}