import java.util.*;

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 ans = A+B;
    ans = ans < A-B ? A-B : ans;
    ans = ans < A*B ? A*B : ans;
    
    System.out.print(ans);
 
      
	}
} 

/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