
import java.util.Scanner;

public class Main {
	public static void main(String arg[]) {
		Scanner sc = new Scanner(System.in);
		
		int A = sc.nextInt();
		int B = sc.nextInt();
		
		if( (A+B) >= (A-B) ) {
			if( (A+B) >= (A*B) ) {
				System.out.print(A+B);
			} else if( (A+B) < (A*B) ) {
				System.out.print(A*B);
			}
		} else if ( (A+B) <= (A-B) ) {
			if( (A-B) >= (A*B) ) {
				System.out.print(A-B);
			} else if( (A-B) < (A*B) ) {
				System.out.print(A*B);
			}
		}
	}

}
/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