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50579 - Pentagonal Numbers

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Time limit 4000/7000/7000/7000 ms. Memory limit 65000/65000/65000/65000 Kb.
Question by Arban Uka.

nth Pentagonal Number

Shqip

In mathematics, pentagonal numbers is calculated with the following formula:

Thus, the first 10 pentagonal numbers: 1, 5, 12, 22, 35, 51, 70, 92, 117, 145.

Write a program that is going to calculate and show nth pentagonal number.

Input specification
There will be just one number (n) where 1 ≤ n ≤ 35000.

Output specification
Show n^th pentagonal number.

Sample Input I: `5`	Sample Input II: `34004`
Sample Output I: `35`	Sample Output II: `1734391022`

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