import java.util.*;

public class Run {
    public static void main (String arg[]) {
        Scanner scan = new Scanner(System.in);
        String ans = "YES";
        int a = scan.nextInt();
        int b = scan.nextInt();
        int c = scan.nextInt();
        int tmp1 = a / b;
        int tmp2 = a / c;

        if (a%b!=0) tmp1++;
        if (a%c!=0) tmp2++;

        if ((tmp1*10)/tmp2 < 15) ans = "NO";
        System.out.println(ans);
    }
}