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%c); //余りが出ると+1 if(campaignremain !=0){ campaign = campaign+1; } //仮設を計算出力 if (nomal*2/3>=campaign){ System.out.println("YES"); } else{ System.out.println("NO"); } } }