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>
#include <stdlib.h>

int main()
{
    int a,b,c,e,f;
    while(~scanf("%d%d",&a,&b))
    {
        if(a==0&&b==0)
        {
            printf("0\n");
        }
        c=a+b;
        e=a-b;
        f=a*b;
        if(c>e&&c>f)
        {
            printf("%d\n",c);
        }
        else if(e>c&&e>f)
        {
            printf("%d\n",e);
        }
        else if(f>c&&f>e)
        {
            printf("%d\n",f);
        }
    }

}