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 Ruby (2.3.3) (judge verdict: Runtime Error)

#include <iostream>
#include <time.h>
#include <math.h>
#include <map>
#include <algorithm>


using namespace std;
int main()
{
	int A[3], cnt = 0;

	cin >> A[0] >> A[1] >> A[2];

	sort(A, A + 3);


	cnt += A[1] - A[0];
	cnt += A[2] - A[1];

	printf("%d", cnt);

	return 0;

}