import java.util.Scanner;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int A = sc.nextInt();
        int B = sc.nextInt();
        int sum = A + B;
        int multi = A * B;
        int minus = A - B;
        if (sum >= multi && sum >= minus) {
            System.out.println(sum);
        } else if (multi > sum && multi > minus) {
            System.out.println(multi);
        } else if (minus > multi && minus > sum) {
            System.out.println(minus);
        }

    }
}

/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