import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;

import static java.lang.System.in;


public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(in));
        int a = Integer.parseInt(reader.readLine());
        int b = Integer.parseInt(reader.readLine());
        int c = Integer.parseInt(reader.readLine());
        int requiredSource = (a + b - 1) / b;
        int requiredSourceDuringCampaign = (a + c - 1) / c;
        if(requiredSource * 2 >= requiredSourceDuringCampaign*3 ) {
            System.out.println("YES");
        } else {
            System.out.println("NO");
        }
    }
}