import java.io.PrintWriter;
import java.util.*;

public class Main {
	public static void main(String[] args) {
		Scanner stdin = new Scanner(System.in);
		PrintWriter out = new PrintWriter(System.out);
		
		int A = Integer.parseInt(stdin.next());
		int B = Integer.parseInt(stdin.next());
		
		int seki = A*B;
		int tasu = A+B;
		int hiku = A-B;

		out.println(Math.max(seki,Math.max(tasu,hiku)));
		out.flush();
	}

	
}
/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