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# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;
using System.Linq;
using System.Collections.Generic;

namespace ABC
{
    class ProgramC
    {
        static void Main(string[] args)
        {
            var num = new int[3];
            var inputs = Console.ReadLine().Split(" ");
            num[0] = int.Parse(inputs[0]);
            num[1] = int.Parse(inputs[1]);
            num[2] = int.Parse(inputs[2]);

            var result = 0;

            while (true)
            {
                if (num[0] == num[1] && num[0] == num[2])
                {
                    Console.WriteLine(result);
                    return;
                }

                result++;

                var min = num.Min();
                var minCount = num.Count(x => x == min);

                for (var i = 0; i < 3; i++)
                {
                    if (num[i] == min)
                    {
                        num[i] += minCount == 1 ? 2 : 1;
                    }
                }
            }

        }
    }
}