#include <vector>
#include <fstream>

using std::vector;
std::ifstream fin("diamant.in");
std::ofstream fout("diamant.out");

int main() {
    int m, n, x;
    fin >> m >> n >> x;

    int dim = (m * (m + 1) / 2) * (n * (n + 1) / 2);
    vector<int> dp(2 * dim + 1);

    dp[dim] = 1;
    for (int i = 1; i <= m; i++)
        for (int j = 1; j <= n; j++)
            for (int k = (int) dp.size() - 1; k >= 0; k--)
                if (k + i * j < (int) dp.size())
                    dp[k + i * j] += dp[k];
    for (int i = 1; i <= m; i++)
        for (int j = 1; j <= n; j++)
            for (int k = 0; k < (int) dp.size(); k++)
                if (k - i * j >= 0)
                    dp[k - i * j] += (dp[k] - 1) / 2;
    fout << dp[dim + x] + 1 << '\n';

    fout.close();
    return 0;
}