URI Online Judge | 1650
# Black and White Painting

**Timelimit: 1**

Local Contest, University of Ulm Germany

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).

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.

Sample Input | Sample Output |

8 8 0 |
0 |