import java.util.*;
public class Main{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		//整数の入力
		int A = sc.nextInt();
		int B = sc.nextInt();
		//計算
		int a = A + B;
		int b = A - B;
		int c = A * B;
		
		if (a > b && a > c){
			System.out.println(a);
		}
		else if (b > c){
			System.out.println(b);
		}
		else {
			System.out.println(c);
		}
	}
}
/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