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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?
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.
Output a single integer: the number of elevators the building must have.
residential 6
2
industrial 20
5
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