

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
		String line = sc.nextLine();
		String[] lines = line.split(" ");
		int A = Integer.parseInt(lines[0]);
		int B = Integer.parseInt(lines[1]);

		int plus = A + B;
		int minus = A - B;
		int astarisc = A * B;
		int max = -10000;
		if (max < plus) {
			max = plus;
		}
		if (max < minus) {
			max = minus;
		}
		if (max < astarisc) {
			max = astarisc;
		}

		System.out.println(max);
	}

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

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
		String line = sc.nextLine();
		String[] lines = line.split(" ");
		int A = Integer.parseInt(lines[0]);
		int B = Integer.parseInt(lines[1]);

		int plus = A + B;
		int minus = A - B;
		int astarisc = A * B;
		int max = -10000;
		if (max < plus) {
			max = plus;
		}
		if (max < minus) {
			max = minus;
		}
		if (max < astarisc) {
			max = astarisc;
		}

		System.out.println(max);
	}

} Main public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
		String line = sc.nextLine();
		String[] lines = line.split(" ");
		int A = Integer.parseInt(lines[0]);
		int B = Integer.parseInt(lines[1]);

		int plus = A + B;
		int minus = A - B;
		int astarisc = A * B;
		int max = -10000;
		if (max < plus) {
			max = plus;
		}
		if (max < minus) {
			max = minus;
		}
		if (max < astarisc) {
			max = astarisc;
		}

		System.out.println(max);
	} main {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
		String line = sc.nextLine();
		String[] lines = line.split(" ");
		int A = Integer.parseInt(lines[0]);
		int B = Integer.parseInt(lines[1]);

		int plus = A + B;
		int minus = A - B;
		int astarisc = A * B;
		int max = -10000;
		if (max < plus) {
			max = plus;
		}
		if (max < minus) {
			max = minus;
		}
		if (max < astarisc) {
			max = astarisc;
		}

		System.out.println(max);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String line = sc.nextLine(); line sc.nextLine() sc.nextLine sc String[] lines = line.split(" "); lines line.split(" ") line.split line " " int A = Integer.parseInt(lines[0]); A Integer.parseInt(lines[0]) Integer.parseInt Integer lines[0] lines 0 int B = Integer.parseInt(lines[1]); B Integer.parseInt(lines[1]) Integer.parseInt Integer lines[1] lines 1 int plus = A + B; plus A + B A B int minus = A - B; minus A - B A B int astarisc = A * B; astarisc A * B A B int max = -10000; max -10000 10000 if (max < plus) {
			max = plus;
		} max < plus max plus {
			max = plus;
		} max = plus max plus if (max < minus) {
			max = minus;
		} max < minus max minus {
			max = minus;
		} max = minus max minus if (max < astarisc) {
			max = astarisc;
		} max < astarisc max astarisc {
			max = astarisc;
		} max = astarisc max astarisc 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) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
		String line = sc.nextLine();
		String[] lines = line.split(" ");
		int A = Integer.parseInt(lines[0]);
		int B = Integer.parseInt(lines[1]);

		int plus = A + B;
		int minus = A - B;
		int astarisc = A * B;
		int max = -10000;
		if (max < plus) {
			max = plus;
		}
		if (max < minus) {
			max = minus;
		}
		if (max < astarisc) {
			max = astarisc;
		}

		System.out.println(max);
	}

} public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
		String line = sc.nextLine();
		String[] lines = line.split(" ");
		int A = Integer.parseInt(lines[0]);
		int B = Integer.parseInt(lines[1]);

		int plus = A + B;
		int minus = A - B;
		int astarisc = A * B;
		int max = -10000;
		if (max < plus) {
			max = plus;
		}
		if (max < minus) {
			max = minus;
		}
		if (max < astarisc) {
			max = astarisc;
		}

		System.out.println(max);
	}

} Main


import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
		String line = sc.nextLine();
		String[] lines = line.split(" ");
		int A = Integer.parseInt(lines[0]);
		int B = Integer.parseInt(lines[1]);

		int plus = A + B;
		int minus = A - B;
		int astarisc = A * B;
		int max = -10000;
		if (max < plus) {
			max = plus;
		}
		if (max < minus) {
			max = minus;
		}
		if (max < astarisc) {
			max = astarisc;
		}

		System.out.println(max);
	}

}
