[pstricks] Plotting a function

[Cosi Lein]

Dear list,
 
I want to plot this function:
 
-0.005x^2+600x-20000
 
Unfortunately it doesn't work and I have no idea why not, because I
plotted some functions earlier without problems. Here is what I've done:
 
\documentclass{article}
\pagestyle{empty}
\usepackage{pst-all,
%          pstricks,
            pstricks-add,
%          pst-node,
            pst-3dplot,
%          pst-tree,
%          pstricks-add,
            amsmath,
            booktabs,
            ngerman}
 
\begin{document}
\psset{xunit=1cm,yunit=1cm,algebraic=true}
\begin{pspicture}(0,0)(12.5,20)
\psaxes[dx=1.5,dy=0.5,Dx=20000,Dy=2000000,ticksize=-2pt,arrowsize=.04,li
newidth=0.7pt]{->}(0,0)(10,5.5)
\psplot[linewidth=1pt,linecolor=red]{0}{100}{-0.005*x^2+600*x-20000}
\end{pspicture}
\end{document}
 
Is there anyone who find my mistake?
 
Thank you for help in advance,
Cosi
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