#include <fstream>
using namespace std;
ifstream f("teren.in");
ofstream g("teren.out");
int i,j,x,n,m,sus,jos,a[301][301],b[301],st,dr,s;
int main()
{
    f>>n>>m>>x;
    for(i=1;i<=n;i++)
        for(j=1;j<=m;j++){
            f>>a[i][j];
            a[i][j]+=a[i-1][j];
        }
    int max=0;
    for(sus=1;sus<=n;sus++)
        for(jos=sus;jos<=n;jos++){
            st=1;s=0;
            for(dr=1;dr<=m;dr++){
                b[dr]=a[jos][dr]-a[sus-1][dr];


        s+=b[dr];
        while(x<s&&st<dr){
            s-=b[st];
            st++;
                }
        if((jos-sus+1)*(dr-st+1)>max&&s<=x)
            max=(jos-sus+1)*(dr-st+1);

            }




        }
        g<<max;
    return 0;
}