import java.io.BufferedReader;
import java.io.InputStreamReader;

public class No218 {
    public static void main(String[] args) {
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(
                    System.in));
            int a = Integer.parseInt(br.readLine());
            int b = Integer.parseInt(br.readLine());
            int c = Integer.parseInt(br.readLine());

            double normal = Math.ceil(a / (double) b);
            double campeign = Math.ceil(a / (double) c);

            String str = "NO";
            if (normal * (2 / 3.0) >= campeign) {
                str = "YES";
            }

            System.out.println(str);
        } catch (Exception e) {
            System.err.println("Error:" + e.getMessage());
        }
    }

    static int[] strToIntArray(String S) {
        String[] strArray = S.split(" ");
        int[] intArray = new int[strArray.length];
        for (int i = 0; i < strArray.length; i++) {
            intArray[i] = Integer.parseInt(strArray[i]);
        }
        return intArray;
    }
}