#include <iostream>
#include <fstream>
using namespace std;
ifstream fin ("teren.in");
ofstream fout ("teren.out");
int n,m,x,v[301][301],s[301][301],smax;
int main()
{
    fin >>n>>m>>x;
    for (int i=1;i<=n;i++)
        {for (int j=1;j<=m;j++)
             {fin >>v[i][j];}}
    for (int i=1;i<=n;i++)
        {for (int j=1;j<=m;j++)
              s[i][j]=s[i-1][j]+v[i][j];}
    for (int l1=1;l1<=n;l1++)
        {for (int l2=l1;l2<=n;l2++)
             {int p=1,sum=0;
              for (int u=1;u<=m;u++)
                  {sum=sum+s[l2][u]-s[l1-1][u];
                   while (p<=u && sum>x)
                         {sum=sum-(s[l2][p]-s[l1-1][p]);
                          p++;}
                   if (smax<(l2-l1+1)*(u-p+1)) {smax=(l2-l1+1)*(u-p+1);}}}}
    fout <<smax;
    return 0;
}