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;

namespace ConsoleApp4
{
    class Program
    {
        static void Main(string[] args)
        {
            string read = Console.ReadLine();
            int A1 = int.Parse(read.Split(' ')[0]);
            int B1 = int.Parse(read.Split(' ')[1]);
            int C1 = int.Parse(read.Split(' ')[2]);

            int A = Math.Min(A1, Math.Min(B1, C1));
            int C = Math.Max(A1, Math.Max(B1, C1));
            int B = A1 + B1 + C1 - A - C;
            int output = 0;

            if ((C - A) % 2 == 0)
            {
                output = (C - A) / 2;
                if ((C - B) % 2 == 0)
                {
                    output += (C - B) / 2;
                }
                else
                {
                    output += (C - B) / 2 + 2;
                }
            }
            else
            {
                output = (C - A) / 2;
                if ((C - B) % 2 == 0)
                {
                    output += (C - B) / 2 + 2;
                }
                else
                {
                    output += (C - 1 - B) / 2 + 1;
                }
            }
            Console.WriteLine(output);
        }

    }
}