#include <fstream>

using namespace std;
int a[301][301],s[301][301];
int main()
{  int n,m,i,j,k,ii,jj,aria=0,sum;
    ifstream f("teren.in");
    ofstream g("teren.out");
    f>>n>>m>>k;
    for (i=1;i<=n;++i)
    for (j=1;j<=m;++j) {
        f>>a[i][j];
        s[i][j]=s[i-1][j]+s[i][j-1]-s[i-1][j-1]+a[i][j];
    }
    for (i=1;i<=n;++i)
    for (j=1;j<=m;++j) {
        ii=i;jj=j;
        for (ii=i;ii<=n;++ii)
        for (jj=j;jj<=m;++jj) {
            sum=s[ii][jj]-s[i-1][jj]-s[ii][j-1]+s[i-1][j-1];
            if (sum<=k) aria=max(aria,(ii-i+1)*(jj-j+1));
        }
    }
       g<<aria<<"\n";
    return 0;
}