import java.util.Scanner;
class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		int max = Math.max(A-B, A+B);
		max = Math.max(max, A*B);
		System.out.println(max);
	}
} import java.util.Scanner; Scanner java.util class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		int max = Math.max(A-B, A+B);
		max = Math.max(max, A*B);
		System.out.println(max);
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		int max = Math.max(A-B, A+B);
		max = Math.max(max, A*B);
		System.out.println(max);
	} main {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		int max = Math.max(A-B, A+B);
		max = Math.max(max, A*B);
		System.out.println(max);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int A = sc.nextInt(); A sc.nextInt() sc.nextInt sc int B = sc.nextInt(); B sc.nextInt() sc.nextInt sc int max = Math.max(A-B, A+B); max Math.max(A-B, A+B) Math.max Math A-B A B A+B A B max = Math.max(max, A*B) max Math.max(max, A*B) Math.max Math max A*B A B System.out.println(max) System.out.println System.out System System.out max String[] args args
import java.util.Scanner;
class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		int max = Math.max(A-B, A+B);
		max = Math.max(max, A*B);
		System.out.println(max);
	}
}
