poj 3364 Black and white pain...

#include <iostream>#include <cstdio>using namespace std;int main(){    int n,m,i;    while(scanf("%d%d%d",&n,&m,&i))    {        if(n == 0 && m == 0 && i == 0) break;        n = n-7;        m = m-7;        if((n*m)%2 == 0)        { cout << (n*m)/2 <<endl;        }        else        { if(i == 1) {     cout << (n*m)/2 +1 <<endl; } if(i == 0) {     cout << (n*m)/2 <<endl; }        }    }    return 0;}