import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n1 = sc.nextInt();
        int n2 = sc.nextInt();
         int add = n1+n2;
         int mul = n1*n2;
         int sub = n1-n2;
        // System.out.println(add);
        // System.out.println(mul);
        // System.out.println(sub);
         if(add>mul &&add>sub)System.out.println(add);
         else if(mul>sub)
            System.out.println(mul);
         else System.out.println(sub);
         
    }
}

/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