Problem:
Score : 100 points

Problem Statement

You are given two integers A and B.
Find the largest value among A+B, A-B and A \times B.

Constraints

-1000 \leq A,B \leq 1000

All values in input are integers.

Input

Input is given from Standard Input in the following format:

A B

Output

Print the largest value among A+B, A-B and A \times B.

Sample Input 1

3 1

Sample Output 1

4

3+1=4, 3-1=2 and 3 \times 1=3. The largest among them is 4.

Sample Input 2

4 -2

Sample Output 2

6

The largest is 4 - (-2) = 6.

Sample Input 3

0 0

Sample Output 3

0

Solution in C (GCC 5.4.1) (judge verdict: Wrong Answer)

#include<stdio.h>

int main(){
    int a, b, valuePlus, valueMinus, valueProduct;
    scanf("%d", &a);
    scanf("%d", &b);

    valuePlus = a + b;
    valueMinus = a - b;
    valueProduct = a * b;


    if(a >= -1000 && a <= 1000 && b >= -1000 && b <= 1000){
        if(a == 0 && b == 0){
            printf("0");
        }else{
            if(valuePlus > valueMinus && valuePlus > valueProduct){
                printf("%d\n", valuePlus);
            }else if(valueMinus > valuePlus && valueMinus > valueProduct){
                printf("%d\n", valueMinus);
            }else if(valueProduct > valuePlus && valueProduct > valueMinus){
                printf("%d\n", valueProduct);
            }
        }
    }

    return 0;
}