UVA 11231 - Black And White Painting

#include <bits/stdc++.h>

#define vii vector<vector<int> >
#define vi vector<int>
#define ii pair<int, int>

#define ll long long

using namespace std;

int main()
{
    int n, m, c;
    while(1){
        scanf("%d%d%d", &n, &m, &c);
        if(!n && !m && !c) return 0;
        m-=8;
        n-=8;
        int ans = 0;
        if(c){
            ans = (m / 2 + 1) * (n / 2 + 1);
            m--; n--;
            if(m >= 0 && n >= 0) ans += (m / 2 + 1) * (n / 2 + 1);
        }else{
            if(m > 0){
                m--;
                ans = (m / 2 + 1) * (n / 2 + 1);
                m++;
            }
            if(n > 0){
                n--;
                ans += (m / 2 + 1) * (n / 2 + 1);
                n++;
            }
        }
        printf("%d\n", ans);
    }
}