import java.util.*;

public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt(), b = sc.nextInt();
		sc.close();
		int ans = a + b;
		int tmp = a - b;
		ans = Math.max(ans, tmp);
		tmp = a * b;
		ans = Math.max(ans, tmp);
		System.out.println(ans);
	}
} import java.util.*; util.* java public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt(), b = sc.nextInt();
		sc.close();
		int ans = a + b;
		int tmp = a - b;
		ans = Math.max(ans, tmp);
		tmp = a * b;
		ans = Math.max(ans, tmp);
		System.out.println(ans);
	}
} Main public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt(), b = sc.nextInt();
		sc.close();
		int ans = a + b;
		int tmp = a - b;
		ans = Math.max(ans, tmp);
		tmp = a * b;
		ans = Math.max(ans, tmp);
		System.out.println(ans);
	} main {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt(), b = sc.nextInt();
		sc.close();
		int ans = a + b;
		int tmp = a - b;
		ans = Math.max(ans, tmp);
		tmp = a * b;
		ans = Math.max(ans, tmp);
		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 b = sc.nextInt(); b sc.nextInt() sc.nextInt sc sc.close() sc.close sc int ans = a + b; ans a + b a b int tmp = a - b; tmp a - b a b ans = Math.max(ans, tmp) ans Math.max(ans, tmp) Math.max Math ans tmp tmp = a * b tmp a * b a b ans = Math.max(ans, tmp) ans Math.max(ans, tmp) Math.max Math ans tmp 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) throws Exception {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt(), b = sc.nextInt();
		sc.close();
		int ans = a + b;
		int tmp = a - b;
		ans = Math.max(ans, tmp);
		tmp = a * b;
		ans = Math.max(ans, tmp);
		System.out.println(ans);
	}
} public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt(), b = sc.nextInt();
		sc.close();
		int ans = a + b;
		int tmp = a - b;
		ans = Math.max(ans, tmp);
		tmp = a * b;
		ans = Math.max(ans, tmp);
		System.out.println(ans);
	}
} Main
import java.util.*;

public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt(), b = sc.nextInt();
		sc.close();
		int ans = a + b;
		int tmp = a - b;
		ans = Math.max(ans, tmp);
		tmp = a * b;
		ans = Math.max(ans, tmp);
		System.out.println(ans);
	}
}
