#include <iostream>
#include <fstream>
using namespace std;
 
ifstream fin("teren.in");
ofstream fout("teren.out");
int N, M, X, sol;
short a[311][311], s[311][311];
 
int main()
{
    fin >> N >> M >> X;
    for (int i = 1; i <= N; i++)
        for (int j = 1; j <= M; j++)
            fin >> a[i][j], s[i][j] = s[i - 1][j] + a[i][j];
 
    for (int l1 = 1; l1 <= N; l1++)
        for (int l2 = l1; l2 <= N; l2++)
        {
            int left = 0, sum = 0, suml = 0;
            for (int c = 1; c <= M; c++)
            {
                sum = sum + s[l2][c] - s[l1 - 1][c];
                while (sum - suml > X)
                {
                    left++;
                    suml = suml + s[l2][left] - s[l1 - 1][left];
                }
                if (sol < (l2 - l1 + 1) * (c - left))
                {
                    sol = (l2 - l1 + 1) * (c - left);
                }
            }
        }
 
    fout << sol << '\n';
    fout.close();
    return 0;
}