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();
		sc.close();
		int max = A + B;
		if(A - B > max){
			max = A - B;
			if(A * B > max){
				max = A * B;
			}
		}else if(A * B > max){
			max = A * B;
		}
		System.out.println(max);
	}
} 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();
		sc.close();
		int max = A + B;
		if(A - B > max){
			max = A - B;
			if(A * B > max){
				max = A * B;
			}
		}else if(A * B > 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();
		sc.close();
		int max = A + B;
		if(A - B > max){
			max = A - B;
			if(A * B > max){
				max = A * B;
			}
		}else if(A * B > max){
			max = A * B;
		}
		System.out.println(max);
	} main {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		sc.close();
		int max = A + B;
		if(A - B > max){
			max = A - B;
			if(A * B > max){
				max = A * B;
			}
		}else if(A * B > 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 sc.close() sc.close sc int max = A + B; max A + B A B if(A - B > max){
			max = A - B;
			if(A * B > max){
				max = A * B;
			}
		}else if(A * B > max){
			max = A * B;
		} A - B > max A - B A B max {
			max = A - B;
			if(A * B > max){
				max = A * B;
			}
		} max = A - B max A - B A B if(A * B > max){
				max = A * B;
			} A * B > max A * B A B max {
				max = A * B;
			} max = A * B max A * B A B if(A * B > max){
			max = A * B;
		} A * B > max A * B A B max {
			max = A * B;
		} max = A * B max A * B A B System.out.println(max) System.out.println System.out System System.out max 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();
		sc.close();
		int max = A + B;
		if(A - B > max){
			max = A - B;
			if(A * B > max){
				max = A * B;
			}
		}else if(A * B > max){
			max = A * B;
		}
		System.out.println(max);
	}
} public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		sc.close();
		int max = A + B;
		if(A - B > max){
			max = A - B;
			if(A * B > max){
				max = A * B;
			}
		}else if(A * B > max){
			max = A * B;
		}
		System.out.println(max);
	}
} Main
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();
		sc.close();
		int max = A + B;
		if(A - B > max){
			max = A - B;
			if(A * B > max){
				max = A * B;
			}
		}else if(A * B > max){
			max = A * B;
		}
		System.out.println(max);
	}
}