#include <bits/stdc++.h>
using namespace std;

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