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Time Limit: 1.0 Seconds Memory Limit: 65536K

Total Runs: 693 Accepted Runs: 460

You are visiting the Centre Pompidou which contains a lot of modern paintings. In particular you notice one painting which consists solely of black and white squares, arranged in rows and columns like in a chess board (no two adjacent squares have the same colour). By the way, the artist did not use the tool of problem A to create the painting.

Since you are bored, you wonder how many *8 × 8*
chess boards are embedded within this
painting. The bottom right corner of a chess board must always be white.

The input contains several test cases.
Each test case consists of one line with three integers
**n**, **m** and **c**.
(*8 ≤ n, m ≤ 40000*), where **n** is the number of
rows of the painting, and **m** is the number of columns
of the painting. **c** is always *0* or *1*,
where *0* indicates that the bottom right corner of the painting
is black, and *1* indicates that this corner is white.

The last test case is followed by a line containing three zeros.

For each test case, print the number of chess boards embedded within the given painting.

8 8 0 8 8 1 9 9 1 40000 39999 0 0 0 0

0 1 2 799700028

Maintance:Fxz. Developer: SuperHacker, G.D.Retop, Fxz