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 Python (3.4.3) (judge verdict: Runtime Error)

N, M = list(map(int, input().split(' ')))
edges = []
for i in range(M):
    a, b = list(map(int, input().split(' ')))
    edges.append([v for v in range(a, b)])

ans = 0
while any(edges):
    hit_index = 0
    max_hit = 0
    edge = []
    for i in range(len(edges)):
        if edges[i]:
            edge = edges[i]
            break
    for v in edge[::-1]:
        hit = 0
        for i in range(M):
            if edges[i] and v in edges[i]:
                hit += 1
            if hit > max_hit:
                max_hit = hit
                hit_index = v
    # print('max_hit')
    # print(max_hit)
    # print('cut here')
    # print(hit_index)
    for i in range(len(edges)):
        if edges[i] and hit_index in edges[i]:
            edges[i] = False
    ans += 1
    # print('cutted')
    # print(edges)
print(ans)