import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        
        Scanner in = new Scanner(System.in);
        int num1 = in.nextInt();
        int num2 = in.nextInt();
        int ans;
        
        ans = Math.max(num1 + num2,num1 - num2);
        ans = Math.max(ans,num1 * num2);
        System.out.println(ans);

        
    }
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz