import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
//入力文字をの読み取り
    	Scanner sc = new Scanner(System.in);
        //1文字目
        long a = sc.nextLong();
        //2文字目
        long b = sc.nextLong();
        //3文字目
        long c = sc.nextLong();


        //通常での必要な素材数
        long nomal = a/b;
        int nomalremain = (int) (a%b);
      //余りが出ると+1
        if(nomalremain !=0){
        	nomal = nomal+1;
        }

        //キャンペーン期間での必要な素材数
        long campaign = a%c;
        int campaignremain = (int) (a%b);
        //余りが出ると+1
        if(campaignremain !=0){
        	campaign = campaign+1;
        }

        //仮設を計算出力
       if (nomal<=campaign/2*3){
    		System.out.println("YES");
       }
       else{
    	   System.out.println("NO");
       }
    }
}