import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		final int A = Integer.parseInt(sc.next());
		final int B = Integer.parseInt(sc.next());
		int ans = A + B;
		if(A * B > ans) {
			ans = A * B;

		}
		if(A - B > ans) {
			ans = A - B;
		}
		System.out.println(ans);
	}

} import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		final int A = Integer.parseInt(sc.next());
		final int B = Integer.parseInt(sc.next());
		int ans = A + B;
		if(A * B > ans) {
			ans = A * B;

		}
		if(A - B > ans) {
			ans = A - B;
		}
		System.out.println(ans);
	}

} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		final int A = Integer.parseInt(sc.next());
		final int B = Integer.parseInt(sc.next());
		int ans = A + B;
		if(A * B > ans) {
			ans = A * B;

		}
		if(A - B > ans) {
			ans = A - B;
		}
		System.out.println(ans);
	} main {
		Scanner sc = new Scanner(System.in);
		final int A = Integer.parseInt(sc.next());
		final int B = Integer.parseInt(sc.next());
		int ans = A + B;
		if(A * B > ans) {
			ans = A * B;

		}
		if(A - B > ans) {
			ans = A - B;
		}
		System.out.println(ans);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) final int A = Integer.parseInt(sc.next()); A Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc final int B = Integer.parseInt(sc.next()); B Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc int ans = A + B; ans A + B A B if(A * B > ans) {
			ans = A * B;

		} A * B > ans A * B A B ans {
			ans = A * B;

		} ans = A * B ans A * B A B if(A - B > ans) {
			ans = A - B;
		} A - B > ans A - B A B ans {
			ans = A - B;
		} ans = A - B ans 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);
		final int A = Integer.parseInt(sc.next());
		final int B = Integer.parseInt(sc.next());
		int ans = A + B;
		if(A * B > ans) {
			ans = A * B;

		}
		if(A - B > ans) {
			ans = A - B;
		}
		System.out.println(ans);
	}

} public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		final int A = Integer.parseInt(sc.next());
		final int B = Integer.parseInt(sc.next());
		int ans = A + B;
		if(A * B > ans) {
			ans = A * B;

		}
		if(A - B > ans) {
			ans = A - B;
		}
		System.out.println(ans);
	}

} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		final int A = Integer.parseInt(sc.next());
		final int B = Integer.parseInt(sc.next());
		int ans = A + B;
		if(A * B > ans) {
			ans = A * B;

		}
		if(A - B > ans) {
			ans = A - B;
		}
		System.out.println(ans);
	}

}
