#include <fstream>
using namespace std;
ifstream in("teren.in");
ofstream out("teren.out");
int n,m,k,dr,i,x,j,st,b[301],nr,a[301][301];
int main () {
    in>>n>>m>>x;
    int max=0;
    for(i=1;i<=n;i++)
        for(j=1;j<=m;j++){
            in>>k;
            a[i][j]=a[i-1][j]+k;}
    for(i=1;i<=n;i++)
        for(j=i;j<=n;j++){
          nr=0;st=1;
            for(dr=1;dr<=m;dr++){
                b[dr]=a[j][dr]-a[i-1][dr];
                nr+=b[dr];
                while(nr>x&&st<dr){
                    nr=nr-b[st]; st++;}
                if(nr<=x&&(j-i+1)*(dr-st+1)>max)
                    max=(j-i+1)*(dr-st+1);
                }
        }
    out<<max;
    return 0;
}