Problems

# Compact discs

# Compact discs

Blank compact discs are on sale in packages of three kinds. A package with **100** disсs costs **100** UAH, one with **20** discs costs **30** UAH, and one disс costs **2** UAH. What minimal sum of money should you pay to buy **n** such disсs?

#### Input

The natural number **n** (**n** ≤ **1000**).

#### Output

Print the minimal sum to buy **n** disсs.

.

Input example #1

123

Output example #1

136