import java.util.Scanner;
public class Main{
    public static void main(String[] args){
        Scanner s = new Scanner(System.in);
        int a = s.nextInt(), b = s.nextInt();
        int sum = a + b, c = a - b, d = a * b;
        int max = sum;
        if(sum < c){
            if(c < d){
                max = d;
            } else{
                max = c;
            }
        } else if(sum < d){
            max = d;
        }
        System.out.println(max);
    }
}
/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