Elevators | cho.sh

문제

Whenever a new building is built, it must comply with all the relevant building regulations. In particular, there are rules governing the number of elevators a building must have depending on its number of floors and zoning district.

If a building has only one floor, it doesn't need any elevators; otherwise, it needs more elevators the more floors it has, and the exact number depends on its zoning district. The following tables describe the number of elevators necessary for a building in each of the residential, commercial, and industrial zoning districts.

Residential		Commercial		Industrial
Floors	Elevators	Floors	Elevators	Floors	Elevators
$1$	$0$	$1$	$0$	$1$	$0$
$2-5$	$1$	$2-7$	$1$	$2-4$	$1$
$6-10$	$2$	$8-14$	$2$	$5-8$	$2$
$11-15$	$3$	$15-20$	$3$	$9-12$	$3$
$16-20$	$4$			$13-16$	$4$
				$17-20$	$5$

Table 1: Elevator requirements by zone

You are given the zoning district of a new building and how many floors it has. How many elevators does it need?

입력

The only line of input contains a string representing the zoning district of the building ("residential", "commercial", or "industrial"), followed by a space and an integer $N$ ( $1 \leq N \leq 20$ ), the number of floors the building has.

출력

Output a single integer: the number of elevators the building must have.