import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		// 整数の入力
		int a = sc.nextInt();
		// スペース区切りの整数の入力
		int b = sc.nextInt();
       	int add=a+b;
      	int sub=a-b;
      	int mul=a*b;
      
      if(add>=sub){
        if(add>=mul){
          // 出力
		System.out.println(add);
        }else{
           System.out.println(mul);
        }
      }
      else{
             if(sub>=mul){
          // 出力
		System.out.println(sub);
        }else{
           System.out.println(mul);
             }
        }
    }
}
/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