# Sightseeing trip

Very easy

Execution time limit is 1 second

Runtime memory usage limit is 128 megabytes

The pupils from 10-B class decided in the autumn holiday to go on an excursion to the capital. Knowing the number of boys $n$ and girls $m$, determine how many rooms you need to book in a hotel, if each room has $k$ beds and it is forbidden to settle boys and girls together.

## Input

One line contains three numbers $n,m,k(n,m,k≤100)$.

## Output

Print the number of rooms to book in the hotel.

## Examples

Input #1

Answer #1

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