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 arc094_a
{
    class Program
    {
        static void Main(string[] args)
        {
            var ABC = (Console.ReadLine().Split().Select(x => decimal.Parse(x))).ToList();

            ABC.Sort();

            decimal r = 0;

            decimal A = Math.Floor((ABC[2] - ABC[0]) / 2);
            r += A;
            ABC[0] += A * 2;

            decimal B = Math.Floor((ABC[2] - ABC[1]) / 2);
            r += B;
            ABC[1] += B * 2;

            if(ABC[0] == ABC[1] && ABC[1] == ABC[2]) 
            {

            }
            else if(ABC[0] != ABC[1]) 
            {
                r += 2;
            }
            else 
            {
                r += 1;
            }

            Console.WriteLine(r);

        }
    }
}