import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        
        int result = a * b;
        if ((a+b) >= (a-b) && (a+b) >= result) {
            result = a + b; 
        } else if ((a-b) >= (a+b) && (a-b) >= result) {
            result = a - b;
        }
        
        System.out.println(result);
    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        
        int result = a * b;
        if ((a+b) >= (a-b) && (a+b) >= result) {
            result = a + b; 
        } else if ((a-b) >= (a+b) && (a-b) >= result) {
            result = a - b;
        }
        
        System.out.println(result);
    }
} Main public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        
        int result = a * b;
        if ((a+b) >= (a-b) && (a+b) >= result) {
            result = a + b; 
        } else if ((a-b) >= (a+b) && (a-b) >= result) {
            result = a - b;
        }
        
        System.out.println(result);
    } main {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        
        int result = a * b;
        if ((a+b) >= (a-b) && (a+b) >= result) {
            result = a + b; 
        } else if ((a-b) >= (a+b) && (a-b) >= result) {
            result = a - b;
        }
        
        System.out.println(result);
    } 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 result = a * b; result a * b a b if ((a+b) >= (a-b) && (a+b) >= result) {
            result = a + b; 
        } else if ((a-b) >= (a+b) && (a-b) >= result) {
            result = a - b;
        } (a+b) >= (a-b) && (a+b) >= result (a+b) >= (a-b) (a+b) a b (a-b) a b (a+b) >= result (a+b) a b result {
            result = a + b; 
        } result = a + b result a + b a b if ((a-b) >= (a+b) && (a-b) >= result) {
            result = a - b;
        } (a-b) >= (a+b) && (a-b) >= result (a-b) >= (a+b) (a-b) a b (a+b) a b (a-b) >= result (a-b) a b result {
            result = a - b;
        } result = a - b result a - b a b System.out.println(result) System.out.println System.out System System.out result String[] args args public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        
        int result = a * b;
        if ((a+b) >= (a-b) && (a+b) >= result) {
            result = a + b; 
        } else if ((a-b) >= (a+b) && (a-b) >= result) {
            result = a - b;
        }
        
        System.out.println(result);
    }
} public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        
        int result = a * b;
        if ((a+b) >= (a-b) && (a+b) >= result) {
            result = a + b; 
        } else if ((a-b) >= (a+b) && (a-b) >= result) {
            result = a - b;
        }
        
        System.out.println(result);
    }
} Main
import java.util.*;

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