p03292 AtCoder Beginner Contest 103 - Task Scheduling Problem
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.

Examples

Input

1 6 3


Output

5


Input

11 5 5


Output

6


Input

100 100 100


Output

0
```python
a,b,c=sorted(map(int,input().split()))
print(abs(a-b)+abs(b-c))
```