import java.util.*;
import java.lang.Math;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		// 整数の入力
		int A = sc.nextInt();
		// スペース区切りの整数の入力
		int B = sc.nextInt();

		int values[] = {A+B, A-B, A*B};
		int max = values[0];
		for(int i = 1; i < 3; i ++){
			max = Math.max(max, values[i]);
		}

		System.out.println(max);
	}
}
/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