import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String[] params = scanner.nextLine().split(" ");
        int a = Integer.parseInt(params[0]);
        int b = Integer.parseInt(params[1]);
        int[] results = {a + b, a - b, a * b};
        int max = -9999999;
        for (int n: results) {
            if (n > max) max = n;
        }
        scanner.close();
        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