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