#include <fstream>



using namespace std;



ifstream fin("teren.in");

ofstream fout("teren.out");



int n,m,k,i,j,ii,jj,dm,dim,x,a[305][305];



int main()

{

    fin >> n >> m >> k;

    for (i=1;i<=n;i++) for(j=1;j<=m;j++)

    {

        fin >> x;

        a[i][j]=a[i][j-1]+a[i-1][j]-a[i-1][j-1]+x;

    }

    for (i=1;i<=n;i++)

    {

        for (ii=i;ii<=n;ii++)

        {

            j=1;

            for (jj=1;jj<=m;jj++)

            {

                while (a[ii][jj]-a[ii][j-1]-a[i-1][jj]+a[i-1][j-1]>k && j<=jj) j++;

                dim=(ii-i+1)*(jj-j+1);

                if (dim>dm) dm=dim;

            }

        }

    }

    fout << dm;



    return 0;

}