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