#include <bits/stdc++.h>
#define MAXN 300

using namespace std;

ifstream fin("teren.in");
ofstream fout("teren.out");

int n, m, x, mat[MAXN + 1][MAXN];
void citire() {
    fin >> n >> m >> x;
    for (int i = 1; i <= n; i++)
        for (int j = 0; j < m; j++)
            fin >> mat[i][j];
}

void sume_partiale() {
    for (int j = 0; j < m; j++)
        for (int i = 2; i <= n; i++)
            mat[i][j] += mat[i - 1][j];
}

void rezolvare() {
    sume_partiale();
    int maxi = 0;
    for (int j = n; j >= 1; j--)
        for (int i = 1; i <= j; i++) {
            int a[MAXN];
            for (int k = 0; k < m; k++)
                a[k] = mat[j][k] - mat[i - 1][k];
            int st = 0, dr = 0, sum = 0;
            while (dr < m) {
                sum += a[dr];
                while (st <= dr && sum > x)
                    sum -= a[st++];
                int arie = (j - i + 1) * (dr - st + 1);
                if (st <= dr && arie > maxi)
                    maxi = arie;
                dr++;
            }
        }
    fout << maxi;
}

int main() {
    citire();
    rezolvare();
    return 0;
}