import java.util.*;
import java.lang.*;
import java.io.*;

class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		int N = 0;
		InputStreamReader is = new InputStreamReader(System.in);
        BufferedReader br = new BufferedReader(is);
        String X1 = br.readLine();
       	String X2 = br.readLine();
       	String X3 = br.readLine();
       	int A = Integer.parseInt(X1);
		int B = Integer.parseInt(X2);
		int C = Integer.parseInt(X3);
       	
       	int D = A / B;
       	if(A % B != 0){
       		D++;
       	}
       	
       	int E = A / C;
       	if(A % B != 0){
       		E++;
       	}
       	
       	if(((D*2)/3) <= E){
       		System.out.println("YES");
       	}else{
       		System.out.println("NO");
       	}
	}
}