import java.util.Scanner;


class Main{

    private static int max(int a,int b){
        if(a > b){
            return a;
        }else{
            return b;
        }
    }
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        int A = sc.nextInt();
        int B = sc.nextInt();

        int a = A+B;
        int b = A-B;
        int c = A*B;

        int ans = (max(max(a,b),c));

        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