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;
using System.Linq;
class Program
{
    static int Main()
    {
        //int n = int.Parse(Console.ReadLine());
        string[] s = Console.ReadLine().Split(' ');
        int a, b, c;
        a = int.Parse(s[0]);
        b = int.Parse(s[1]);
        c = int.Parse(s[2]);

        int[] num = { a, b, c };
        Array.Sort(num);
        Array.Reverse(num);
        Console.WriteLine(num[0] - num[1] + (num[1] - num[2]) / 2 + ((num[1] - num[2]) % 2) * 2);

        return 0;
    }
}