#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;
}