## BLACK - Black and white painting

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.

#### Input Specification

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.

#### Output Specification

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

#### Sample Input

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

#### Sample Output

0 1 2 799700028

Added by: | Adrian Kuegel |

Date: | 2007-07-06 |

Time limit: | 0.100s |

Source limit: | 50000B |

Memory limit: | 1536MB |

Cluster: | Cube (Intel G860) |

Languages: | All except: ERL JS-RHINO NODEJS PERL6 VB.NET |

Resource: | University of Ulm Local Contest 2007 |