import java.io.BufferedReader;
import java.io.*;
import java.util.*;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Collections;
import java.util.Arrays;

public class Main {
	public static void main(final String[] args){
    
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    List<Integer> list = new ArrayList<>();
    int sum1 = 0;
    int sum2 = 0;
    int sum3 = 0;

    sum1 = a + b;
    sum2 = a - b;
    sum3 = a * b;

    if(sum1 >= sum2 && sum1 >= sum3){
        System.out.println(sum1);
    }else if(sum2 >= sum1 && sum2 >= sum3){
        System.out.println(sum2);
    }else{
        System.out.println(sum3);
    }


    

    
    
    



    





}
}
/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