Problem:
Score : 100 points

Problem Statement

You have three tasks, all of which need to be completed.

First, you can complete any one task at cost 0.

Then, just after completing the i-th task, you can complete the j-th task at cost |A_j - A_i|.

Here, |x| denotes the absolute value of x.

Find the minimum total cost required to complete all the task.

Constraints

All values in input are integers.

1 \leq A_1, A_2, A_3 \leq 100

Input

Input is given from Standard Input in the following format:

A_1 A_2 A_3

Output

Print the minimum total cost required to complete all the task.

Sample Input 1

1 6 3

Sample Output 1

5

When the tasks are completed in the following order, the total cost will be 5, which is the minimum:

Complete the first task at cost 0.

Complete the third task at cost 2.

Complete the second task at cost 3.

Sample Input 2

11 5 5

Sample Output 2

6

Sample Input 3

100 100 100

Sample Output 3

0

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;

namespace ABC103A
{
    class Program
    {
        static void Main(string[] args)
        {
            int a, b, c;
            string[] ss = Console.ReadLine().Split(' ');
            a = int.Parse(ss[0]);
            b = int.Parse(ss[1]);
            c = int.Parse(ss[2]);
            int d = a - b;
            int e = b - c;
            int f = a - c;
            if (d < 0)
                d = d * -1;
            if (e < 0)
                e = e * -1;
            if (f < 0)
                f = f * -1;
            if (d >= e && e >= f || d >= f && f >= e)
                Console.WriteLine(e + f);
            else if (e >= f && f >= d || e >= d && d >= f)
                Console.WriteLine(f + d);
            else
                Console.WriteLine(e + d);
            Console.ReadKey();
            
        }
    }
}