import java.util.*;

class Main{
    public static void main(String arg[]){
        Scanner scanner = new Scanner(System.in);
        int A = scanner.nextInt();
        int B = scanner.nextInt();
      
        int sum = A + B;
        int difference = A - B;
        int product = A * B;
        
        //上記の最大値を出力
        System.out.println(Math.max(product, Math.max(sum, difference)));
    }
}
/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