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: Accepted)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using static System.Math;

namespace AtCoderProject
{
    class Program
    {
        static void Main(string[] args)
        {
            var input = ReadLineIntArray();
            int A = input[0];
            int B = input[1];
            int C = input[2];

            int max;
            int count = 0;

            if (A % 2 == 1 && B % 2 == 1 && C % 2 == 1) { }
            else
            if (A % 2 == 0 && B % 2 == 0 && C % 2 == 0) { }
            else
            if (A % 2 == 1 && B % 2 == 0 && C % 2 == 0) { ++B; ++C; ++count; }
            else
            if (A % 2 == 0 && B % 2 == 1 && C % 2 == 1) { ++B; ++C; ++count; }
            else
            if (A % 2 == 1 && B % 2 == 0 && C % 2 == 1) { ++A; ++C; ++count; }
            else
            if (A % 2 == 0 && B % 2 == 1 && C % 2 == 0) { ++A; ++C; ++count; }
            else
            if (A % 2 == 1 && B % 2 == 1 && C % 2 == 0) { ++A; ++B; ++count; }
            else
            if (A % 2 == 0 && B % 2 == 0 && C % 2 == 1) { ++A; ++B; ++count; }

            max = Max(Max(A, B), C);

            count += ((max - A) + (max - B) + (max - C)) / 2;

            Console.WriteLine(count);
        }


        #region READER
        static int ReadLineInt() => int.Parse(Console.ReadLine());
        static int[] ReadLineIntArray() => Console.ReadLine().Split(' ').Select(s => int.Parse(s)).ToArray();

        static IEnumerable<string> ReadInputEnumruble(int count = int.MaxValue)
        {
            for (int i = 0; i < count; i++)
            {
                yield return Console.ReadLine();
            }
        }
        static int[] ReadInputInt(int count = int.MaxValue)
        {
            return ReadInputEnumruble(count).Select(s => int.Parse(s)).ToArray();
        }
        #endregion
    }
}