#include <fstream>

using namespace std;

ifstream f("teren.in");
ofstream g("teren.out");

int n, m, x;
int a[301][301];

int main()
{
    f >> n >> m >> x;
    for (int i=1; i<=n; i++)
        for (int j=1; j<=m; j++)
        {
            f >> a[i][j];
            a[i][j] += a[i-1][j];
        }

    int ariaMax = 0;
    for (int i=1; i<=n; i++)
        for (int ii=i; ii<=n; ii++)
        {
            int sum = 0, st = 1;
            for (int j=1; j<=m; j++)
            {
                sum += a[ii][j] - a[i-1][j];
                while (sum > x)
                {
                    sum -= a[ii][st] - a[i-1][st];
                    st++;
                }
                ariaMax = max(ariaMax, (j - st + 1) * (ii - i + 1));
            }
        }

    g << ariaMax;

    return 0;
}