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();
    int tasu = a + b;
    int hiku = a - b;
    int kake = a * b;
    int ans = Math.max(tasu,hiku);
    ans = Math.max(ans,kake);
    System.out.println(ans);

  }
} 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();
    int tasu = a + b;
    int hiku = a - b;
    int kake = a * b;
    int ans = Math.max(tasu,hiku);
    ans = Math.max(ans,kake);
    System.out.println(ans);

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

  } main {
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    int tasu = a + b;
    int hiku = a - b;
    int kake = a * b;
    int ans = Math.max(tasu,hiku);
    ans = Math.max(ans,kake);
    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 int b = sc.nextInt(); b sc.nextInt() sc.nextInt sc int tasu = a + b; tasu a + b a b int hiku = a - b; hiku a - b a b int kake = a * b; kake a * b a b int ans = Math.max(tasu,hiku); ans Math.max(tasu,hiku) Math.max Math tasu hiku ans = Math.max(ans,kake) ans Math.max(ans,kake) Math.max Math ans kake 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);
    int a = sc.nextInt();
    int b = sc.nextInt();
    int tasu = a + b;
    int hiku = a - b;
    int kake = a * b;
    int ans = Math.max(tasu,hiku);
    ans = Math.max(ans,kake);
    System.out.println(ans);

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

  }
} 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();
    int tasu = a + b;
    int hiku = a - b;
    int kake = a * b;
    int ans = Math.max(tasu,hiku);
    ans = Math.max(ans,kake);
    System.out.println(ans);

  }
}
