import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String[] nums = br.readLine().split(" ");
		int[] numsInt = new int[2];
		numsInt[0] = Integer.parseInt(nums[0]);
		numsInt[1] = Integer.parseInt(nums[1]);
		int max = numsInt[0] + numsInt[1];
		if(max < numsInt[0] - numsInt[1]){
			max = numsInt[0] - numsInt[1];
		}
		if(max < numsInt[0] * numsInt[1]){
			max = numsInt[0] * numsInt[1];
		}
		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