import java.util.*;
class Main {
	public static void main(String[] args)
	{
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		int x = A+B;
		int y = A-B;
		int z = A*B;
		if(x>=y && x>=z) {
			System.out.println(x);
		}else if(y>=x && y>=z) {
			System.out.println(y);
		}else {
			System.out.println(z);
		}
	}
}
/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