#include <fstream>
#define DIM 310
using namespace std;
ifstream fin("teren.in");
ofstream fout("teren.out");
int a[DIM][DIM];
int n, m, x, p, u, s, maxim, y, aria;
int main()
{
    fin >> n >> m >> x;
    for(int i=1; i<=n; i++)
    {
        for(int j=1; j<=m; j++)
        {
            fin >> y;
            a[i][j] = a[i-1][j] + y;
        }
    }
    for(int i=1; i<=n; i++)
    {
        for(int j=i; j<=n; j++)
        {
            p = 1;
            s = 0;
            for(int u=1; u<=m; u++)
            {
                s+=(a[j][u] - a[i-1][u]);
                while(s > x && p<=u)
                {
                    s-=(a[j][p] - a[i-1][p]);
                    p++;
                }
                if(p<=u && s<=x && (j-i+1) * (u-p+1) >= aria)
                    aria = (j-i+1) * (u-p+1);
            }
        }
    }
    fout << aria;
    return 0;
}