import java.util.*;
import java.io.*;
import java.math.*;
 
public class Main{
    public static BufferedReader buff = new BufferedReader(new InputStreamReader(System.in));
    public static PrintWriter output = new PrintWriter(System.out);
    public static Scanner sc = new Scanner(System.in);
    public static final int INFI = Integer.MAX_VALUE;
    public static final long INFL = Long.MAX_VALUE;
    public static final int MOD = 1000000007;
    public static final int [] dy4 = {0,1,0,-1};
    public static final int [] dx4 = {1,0,-1,0};
    public static void main(String[] args) throws IOException{
        StringTokenizer st;
        //st = new StringTokenizer(buff.readLine());
        long A = sc.nextLong();
        long B = sc.nextLong();
        output.print(Math.abs(A) < Math.abs(B)?"Yes":"No");
        output.flush();
    }
}