Problem Statement

It is only six months until Christmas, and AtCoDeer the reindeer is now planning his travel to deliver gifts.
There are $N$ houses along TopCoDeer street. The $i$-th house is located at coordinate $a_i$. He has decided to deliver gifts to all these houses.
Find the minimum distance to be traveled when AtCoDeer can start and end his travel at any positions.

Constraints

• $1 ≤ N ≤ 100$
• $0 ≤ a_i ≤ 1000$
• $a_i$ is an integer.

Input

Input is given from Standard Input in the following format:

$N$ $a_1$ $a_2$ $...$ $a_N$

Output

Print the minimum distance to be traveled.

Sample Input 1

4
2 3 7 9

Sample Output 1

7

The travel distance of $7$ can be achieved by starting at coordinate $9$ and traveling straight to coordinate $2$.
It is not possible to do with a travel distance of less than $7$, and thus $7$ is the minimum distance to be traveled.

Sample Input 2

8
3 1 4 1 5 9 2 6

Sample Output 2

8

There may be more than one house at a position.