#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);

    if (!(-dim <= x && x <= dim)) {
        fout << "0\n";
        fout.close();
        return 0;
    }

    dp[dim] = 1;
    for (int i = 1; i <= m; i++)
        for (int j = 1; j <= n; j++) {
            vector<int> dp1 = dp;
            for (int k = (int) dp1.size() - 1; k >= 0; k--)
                if (k + i * j < (int) dp1.size())
                    dp1[k + i * j] += dp1[k];
            
            vector<int> dp2 = dp;
            for (int k = 0; k < (int) dp2.size(); k++)
                if (k - i * j >= 0)
                    dp2[k - i * j] += dp2[k];

            for (int k = 0; k < (int) dp.size(); k++)
                dp[k] = dp1[k] + dp2[k] - dp[k];
        }
    fout << dp[dim + x] << '\n';

    fout.close();
    return 0;
}