#include <bits/stdc++.h>
using namespace std;
int n, m, s;
long long ans = 0;
int main() {
  int i, j, k;
  int a1, b1, a2, b2;
  int x1, y1, x2, y2;
  int p1, p2;
  cin >> n >> m >> s;
  for (i = 0; i <= n / 2; i++) {
    for (j = 0; j <= m / 2; j++) {
      for (k = 0; k <= n / 2; k++) {
        a1 = i;
        b1 = j;
        a2 = k;
        x1 = 1 + 2 * a1;
        y1 = 1 + 2 * b1;
        x2 = 1 + a2 * 2;
        if (x2 > x1) {
          if ((s - x1 * y1) % (x2 - x1) == 0 && (s - x1 * y1) > 0) {
            y2 = (s - x1 * y1) / (x2 - x1);
            if (y2 <= y1 && y2 > 0 && y2 % 2 == 1) {
              b2 = (y2 - 1) / 2;
              if (((n - 2 * a2) * (m - 2 * b1)) > 0)
                ans += ((n - 2 * a2) * (m - 2 * b1));
            }
          }
          if (s % x2 == 0) {
            y2 = s / x2;
            if (y2 > y1 && y2 % 2 == 1) {
              b2 = (y2 - 1) / 2;
              if (((n - 2 * a2) * (m - 2 * b2)) > 0)
                ans += ((n - 2 * a2) * (m - 2 * b2));
            }
          }
        } else if (x2 == x1) {
          if (x1 * y1 == s) {
            if (((n - 2 * a1) * (m - 2 * b1) * (b1 + 1)) > 0)
              ans += ((n - 2 * a1) * (m - 2 * b1) * (b1 + 1));
          }
          if (s % x1 == 0) {
            y2 = s / x1;
            if (y2 > y1 && y2 % 2 == 1) {
              b2 = (y2 - 1) / 2;
              if (((n - 2 * a1) * (m - 2 * b2)) > 0)
                ans += ((n - 2 * a1) * (m - 2 * b2));
            }
          }
        } else {
          if (s + x2 * y1 - x1 * y1 > 0 && (s + x2 * y1 - x1 * y1) % x2 == 0) {
            y2 = (s + x2 * y1 - x1 * y1) / x2;
            if (y2 > y1 && y2 % 2 == 1) {
              b2 = (y2 - 1) / 2;
              if (((n - 2 * a1) * (m - 2 * b2)) > 0)
                ans += ((n - 2 * a1) * (m - 2 * b2));
            }
          }
          if (x1 * y1 == s) {
            if (((n - 2 * a1) * (m - 2 * b1) * (b1 + 1)) > 0)
              ans += ((n - 2 * a1) * (m - 2 * b1) * (b1 + 1));
          }
        }
      }
    }
  }
  cout << ans << endl;
  return 0;
}
