Problem:
Score : 300 points

Problem Statement

You are given three integers A, B and C. Find the minimum number of operations required to make A, B and C all equal by repeatedly performing the following two kinds of operations in any order:

Choose two among A, B and C, then increase both by 1.

Choose one among A, B and C, then increase it by 2.

It can be proved that we can always make A, B and C all equal by repeatedly performing these operations.

Constraints

0 \leq A,B,C \leq 50

All values in input are integers.

Input

Input is given from Standard Input in the following format:

A B C

Output

Print the minimum number of operations required to make A, B and C all equal.

Sample Input 1

2 5 4

Sample Output 1

2

We can make A, B and C all equal by the following operations:

Increase A and C by 1. Now, A, B, C are 3, 5, 5, respectively.

Increase A by 2. Now, A, B, C are 5, 5, 5, respectively.

Sample Input 2

2 6 3

Sample Output 2

5

Sample Input 3

31 41 5

Sample Output 3

23

Solution in C# (Mono 4.6.2.0) (judge verdict: Wrong Answer)

using System;

class AtCoder
{
    static void Main()
    {
        string[] str = Console.ReadLine().Split(' ');
        int[] nums = new int[3];
        nums[0] = Int32.Parse(str[0]);
        nums[1] = Int32.Parse(str[1]);
        nums[2] = Int32.Parse(str[2]);//3つめの数字
        for (int i = 0; i < nums.Length-1; i++)
        {
            for(int j = 1; j < nums.Length; j++)
            {
                if (nums[j] < nums[i])
                {
                    int temp = nums[j];
                    nums[j] = nums[i];
                    nums[i] = temp;
                }
            }
        }
        
        if (nums[0] % 2 == 0) // num1偶
        {
            if(nums[1] %2 ==0) //num2 1偶
            {
                if(nums[2] %2 == 0) //num3 偶
                {//偶偶偶
                    Console.WriteLine(((nums[2] - nums[0]) + (nums[2] - nums[1])) / 2);
                }
                else//偶偶奇
                Console.WriteLine((1+(nums[2] - nums[0]+1) + (nums[2] - nums[1]+1)) / 2);
            }
            else//偶奇偶
                Console.WriteLine((1 + (nums[2] - nums[0] + 1) + (nums[2] - nums[1] + 1)) / 2);
        }
        else//奇偶偶
            Console.WriteLine((1 + (nums[2]+1 - nums[0]) + (nums[2]+1 - nums[1]+1)) / 2);



    }
}