import 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();

        List<Integer> a = Arrays.asList(A + B, A - B, A * B);
        a.sort(Comparator.reverseOrder());
        System.out.println(a.get(0));
    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int A = sc.nextInt();
        int B = sc.nextInt();

        List<Integer> a = Arrays.asList(A + B, A - B, A * B);
        a.sort(Comparator.reverseOrder());
        System.out.println(a.get(0));
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int A = sc.nextInt();
        int B = sc.nextInt();

        List<Integer> a = Arrays.asList(A + B, A - B, A * B);
        a.sort(Comparator.reverseOrder());
        System.out.println(a.get(0));
    } main {
        Scanner sc = new Scanner(System.in);

        int A = sc.nextInt();
        int B = sc.nextInt();

        List<Integer> a = Arrays.asList(A + B, A - B, A * B);
        a.sort(Comparator.reverseOrder());
        System.out.println(a.get(0));
    } 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 List<Integer> a = Arrays.asList(A + B, A - B, A * B); a Arrays.asList(A + B, A - B, A * B) Arrays.asList Arrays A + B A B A - B A B A * B A B a.sort(Comparator.reverseOrder()) a.sort a Comparator.reverseOrder() Comparator.reverseOrder Comparator System.out.println(a.get(0)) System.out.println System.out System System.out a.get(0) a.get a 0 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();

        List<Integer> a = Arrays.asList(A + B, A - B, A * B);
        a.sort(Comparator.reverseOrder());
        System.out.println(a.get(0));
    }
} public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int A = sc.nextInt();
        int B = sc.nextInt();

        List<Integer> a = Arrays.asList(A + B, A - B, A * B);
        a.sort(Comparator.reverseOrder());
        System.out.println(a.get(0));
    }
} Main
import 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();

        List<Integer> a = Arrays.asList(A + B, A - B, A * B);
        a.sort(Comparator.reverseOrder());
        System.out.println(a.get(0));
    }
}