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## 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.

## 예제 입력 1

residential 6


## 예제 출력 1

2


## 예제 입력 2

industrial 20


## 예제 출력 2

5


## 출처

• 문제를 만든 사람: Ethan Arnold