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;
using System.Linq;
using System.Collections.Generic;
using static System.Console;


class Program
{
    internal static void Main(string[] args)
    {
        int[] inp = ReadLine().Split(' ').Select(s => int.Parse(s)).ToArray();
        int A = inp[0];
        int B = inp[1];
        int C = inp[2];
        int ans = 0;

        var hoge = inp.Where(i => i % 2 == 0).ToList();
        var foo = new List<int>();

        if (hoge.Count == 1)
        {
            hoge = inp.Except(hoge).ToList();
        }

        if (hoge.Count == 2)
        {
            foreach (int i in inp)
            {
                if (hoge.Contains(i))
                {
                    foo.Add(i + 1);
                }
                else
                {
                    foo.Add(i);
                }
            }
            ans++;

        }
        else
        {
            foo = inp.ToList();
        }

        int bar = 0;
        foreach (int i in foo)
        {
            if (i == foo.Max())
            {
                continue;
            }
            bar += foo.Max() - i;
        }

        WriteLine((bar / 2) + ans);
    }
}