import java.util.Scanner;
public class Main{
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);
        int A = scan.nextInt(),B = scan.nextInt();
        if(A+B < A*B && A-B < A*B){
            System.out.println(A*B);

        }else if(A-B < A+B && A*B < A+B){
            System.out.println(A+B);
        }else{
            System.out.println(A-B);
        }
    }
}
/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