#include <fstream>
using namespace std;
ifstream fin("teren.in");
ofstream fout("teren.out");
int n,m,i,j,x,p,t,a[301][301],sc,k,amax;
int main()
{
    fin>>n>>m>>k;
    for(i=1;i<=n;i++)
        for(j=1;j<=m;j++){
            fin>>x;
            a[i][j]=a[i-1][j]+x;
        }
    for(i=1;i<=n;i++)
        for(j=i;j<=n;j++){
            sc=0;
            p=1;
            for(t=1;t<=m;t++){
                sc+=a[j][t]-a[i-1][t];
                for(;sc>k&& p<=t;p++,sc-=a[j][p]-a[i-1][p]);
                amax=max(amax,(t-p+1)*(j-i+1));
        }
    }
    fout<<amax;
    return 0;
}