import java.util.Arrays;
import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int A=sc.nextInt();
		int B=sc.nextInt();
		int ans=0;
		ans = Math.max(Math.max(A+B, A-B),A*B);
		System.out.println(ans);
	}
} import java.util.Arrays; Arrays java.util import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int A=sc.nextInt();
		int B=sc.nextInt();
		int ans=0;
		ans = Math.max(Math.max(A+B, A-B),A*B);
		System.out.println(ans);
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int A=sc.nextInt();
		int B=sc.nextInt();
		int ans=0;
		ans = Math.max(Math.max(A+B, A-B),A*B);
		System.out.println(ans);
	} main {
		Scanner sc = new Scanner(System.in);
		int A=sc.nextInt();
		int B=sc.nextInt();
		int ans=0;
		ans = Math.max(Math.max(A+B, A-B),A*B);
		System.out.println(ans);
	} 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 ans=0; ans 0 ans = Math.max(Math.max(A+B, A-B),A*B) ans Math.max(Math.max(A+B, A-B),A*B) Math.max Math Math.max(A+B, A-B) Math.max Math A+B A B A-B A B A*B A B System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int A=sc.nextInt();
		int B=sc.nextInt();
		int ans=0;
		ans = Math.max(Math.max(A+B, A-B),A*B);
		System.out.println(ans);
	}
} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int A=sc.nextInt();
		int B=sc.nextInt();
		int ans=0;
		ans = Math.max(Math.max(A+B, A-B),A*B);
		System.out.println(ans);
	}
} Main
import java.util.Arrays;
import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int A=sc.nextInt();
		int B=sc.nextInt();
		int ans=0;
		ans = Math.max(Math.max(A+B, A-B),A*B);
		System.out.println(ans);
	}
}