#include <fstream>
using namespace std;
int s[301][301], i, j, k, n, m, x, nr, amax, st, dr, suma;
int main ()
{
    ifstream fin ("teren.in");
    ofstream fout ("teren.out");
    fin>>n>>m>>x;
    for (i=1; i<=n; i++)
        for (j=1; j<=m; j++)
        {
            fin>>nr;
            s[i][j]=s[i-1][j]+nr;
        }
    for (i=1; i<=n; i++)
        for (j=i; j<=n; j++)
        {
            suma=0;
            st=1;
            for (dr=1; dr<=m; dr++)
            {
                suma+=s[j][dr]-s[i-1][dr];
                while (suma>x && st<=dr)
                {
                    suma=suma-s[j][st]+s[i-1][st];
                    st++;
                }
                if ((j-i+1)*(dr-st+1)>amax)
                    amax=(j-i+1)*(dr-st+1);
            }
        }
    fout<<amax;


}