2454. Black and white painting

单点时限: 2.0 sec

内存限制: 256 MB

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.

输入格式

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.

输出格式

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

样例

Input
8 8 0
8 8 1
9 9 1
40000 39999 0
0 0 0
Output
0
1
2
799700028

15 人解决,35 人已尝试。

19 份提交通过,共有 86 份提交。

8.6 EMB 奖励。

创建: 10 年,11 月前.

修改: 2 年,5 月前.

最后提交: 8 月,1 周前.

来源: Ulm Local 2007

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