#include<iostream>
#include<fstream>
using namespace std;
int n,m,x,s[301][301],l[301],i,j,k,c,pam,in=1;
int main()
{
    fstream f,g;
	f.open("teren.in",ios::in);
	g.open("teren.out",ios::out);
	f>>n>>m>>x;

    for(i=1;i<=n;i++)
		for(j=1;j<=m;j++)
			f>>s[i][j];
    for(j=1;j<=m;j++)
		for(i=1;i<=n;i++)
			s[i][j]=s[i-1][j]+s[i][j];
    for(i=1;i<=n;i++)
        for(j=i;j<=n;j++)
        {
            c=0;
            in=1;
            for(k=1;k<=m;k++)
            l[k]=s[j][k]-s[i-1][k];
            for(k=1;k<=m;k++)
            {
                c+=l[k];
                while(in<=k&&c>x)
                c-=l[in],in++;
                if((j-i+1)*(k-in+1)>pam)
                pam=(j-i+1)*(k-in+1) ;
            }
        }
   g<<pam;
}