import java.util.Arrays;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		//String s=sc.next();
		//String[] t=new String[4];
		int n = sc.nextInt();
		int m = sc.nextInt();
		//int k = sc.nextInt();
		long count=0;
		long count1=0;
		int[] array = new int[3];
		array[0]=n-m;
		array[1]=n*m;
		array[2]=n+m;
		Arrays.sort(array);

		/*for(int i=0;i<4;i++) {
			t[i]=s.substring(i,i+1);
			System.out.println(t[i]);
		}*/

		/*if(count>2||count1>=2) {
			System.out.println("No");
		}else {
			System.out.println("Yes");
		}*/

		System.out.println(array[2]);
	}
}



/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