#include <fstream>

using namespace std;
ifstream fin("teren.in");
ofstream fout("teren.out");
int m,n,x,a[301][301],sum[301][301],amax;
int main()
{
    fin>>n>>m>>x;
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=m;j++)
        {
            fin>>a[i][j];
            sum[i][j]=a[i][j]+sum[i-1][j]+sum[i][j-1]-sum[i-1][j-1];
        }
    }
    for(int l1=1;l1<=n;l1++)
    {
        for(int l2=l1;l2<=n;l2++)
        {
            int st=1;
            for(int dr=1;dr<=m;dr++)
            {
                int s=sum[l2][dr]-sum[l1-1][dr]-sum[l2][st-1]+sum[l1-1][st-1];
                while(s>x && st<=dr)
                {
                    st++;
                    s=sum[l2][dr]-sum[l1-1][dr]-sum[l2][st-1]+sum[l1-1][st-1];
                }
                if(s<=x)
                {
                    int l=(l2-l1+1)*(dr-st+1);
                    if(l>amax)
                    {
                        amax=l;
                    }
                }
            }
        }
    }
    fout<<amax;
    return 0;
}