Compact discs

Blank compact discs are available in three different package options:

• A package of 100 discs for 100 UAH

• A package of 20 discs for 30 UAH

• A single disc for 2 UAH

Your goal is to buy at least $n$ discs using the minimum amount of money possible.

Input

The input consists of a single integer $n$ $(1\le n\le 1000)$, representing the number of discs you want to buy.

Output

Print the minimum amount of money needed to buy at least $n$ discs.

Examples