poj 3364 Black and white painting

Black and white painting

Time Limit: 1000MS		Memory Limit: 65536K
Total Submissions: 2326		Accepted: 1574

Description

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

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

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

#include<iostream>
using namespace std;

int main() 
{ 
    int m, n, c,ans; 
    while(1) 
    { 
        scanf("%d%d%d", &m, &n, &c); 
        if(m==0 && n==0 && c==0)    
             break;
        m=m-7;n=n-7;
        ans=(m*n)/2;
        if(m%2==1 && n%2==1)
            ans=ans+c;
        printf("%d\n",ans);
    }
    return 0;
}