## LCC '18 Contest 4 J3 - Minecraft Construction Contractor

Points: 5 (partial)
Time limit: 2.0s
Memory limit: 64M

Author:
Problem type

Junyi is a Minecraft home designer, who is widely sought after for his straightforward rectangular designs. To construct a house, he builds a rectangular room with $$4$$ walls and $$1$$ roof. Additionally, to construct all his houses, he uses diamond blocks, which are crafted using $$9$$ diamonds. When Junyi mines, he finds diamonds at a rate of $$32$$ per hour. He only mines for full hours at a time, so he will sometimes return with extra diamonds.

Given the house dimensions a customer gives Junyi, can you calculate how many hours Junyi must mine in order to get enough diamonds to complete the house?

#### Input Specification

The first and only line of input will contain three space-separated integers, $$L$$, $$W$$, $$H$$, representing the length, width and height, respectively, of the house.

#### Output Specification

The minimum integer number of hours Junyi must mine for in order to craft the number of blocks needed to construct his customer's house.

#### Constraints

$$L$$, $$W$$ $$(3 \le L, W \le 10^3)$$

$$H$$ $$(2 \le H \le 256)$$

#### Sample Input

32 20 15

#### Sample Output

574