import java.util.Scanner;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;

class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int a = in.nextInt();
        int b = in.nextInt();
        int c = in.nextInt();

        int normalCnt = 0;
        int normal = 0;

        while(normal < a) {
            normalCnt++;
            normal += b;
        }

        int upCnt = 0;
        int up = 0;

        while(up < a) {
            upCnt++;
            up += c;
        }

        double yosou = (double)normalCnt * 2.0 / 3.0;

        if(upCnt <= yosou) System.out.println("YES");
        else System.out.println("NO");

        in.close();
    }
}