using System;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        int a = int.Parse(Console.ReadLine());
        int b = int.Parse(Console.ReadLine());
        int c = int.Parse(Console.ReadLine());

        double maxB = 0;
        double maxC = 0;

        maxB = Math.Ceiling((double)a / b);
        maxC = Math.Ceiling((double)a / c);

        Console.WriteLine(maxB * 2 / 3 == maxC ? "YES" : "NO");
    }
}