#include <fstream>

using namespace std;

int n,m,a[301][301],i,j,ii,jj,x,y,p,maxim;

long long s,ok;

ifstream fin ("teren.in");

ofstream fout ("teren.out");

int main (){

    fin>>n>>m>>p;
    for (i=1;i<=n;i++)
        for (j=1;j<=m;j++)
            fin>>a[i][j];
    for (i=1;i<=n;i++)
        for (j=1;j<=m;j++)
            for (ii=i;ii<=n;ii++){
                for (jj=j;jj<=m;jj++){
                    s = 0;
                    for (x=i;x<=ii;x++)
                        for (y=j;y<=jj;y++)
                            s+=a[x][y];
                    if ((ii-i+1)*(jj-j+1) > maxim && s<=p){
                        maxim = (ii-i+1)*(jj-j+1);
                       //ok = (ii-i+1)*(jj-j+1);
                    }
                }
            }

    fout<<maxim;

    return 0;
}