\documentclass[12pt]{article}
\usepackage{listings}
\usepackage{fullpage}
\usepackage{url}
\usepackage{amsmath}
\usepackage{comment}
%\usepackage{hyperref}

%\usepackage{verbatim}
\usepackage{setspace}
\usepackage{sectsty}
\usepackage{mathdots}
%\usepackage[pdftex]{graphicx}



% This
% ANY LATEX paper.  Typically I'll use this file and some other file in the
% directory of the paper, this one for general math things, that one for
% things specific to that paper.
%
% font's used and general paper things.
\font\tenrm=cmr10
\font\ninerm=cmr9
\font\eightrm=cmr8
\font\sevenrm=cmr7
% \font\title=cmbx10 scaled \magstep1 % extra big title font
\font\ss=cmss10 % used by \proof
\font\smallcaps=cmcsc10 % used to label Theorems, etc.
% imhibit black bars on overflows
%
\overfullrule=0pt
%
% today's date
%
%
% English words that I always italizice in papers.
% Some words that appear in math mode alot that I wasn roman
%



\begin{document}

%\lstset{language=Pascal}
\newcommand{\While}{{\bf While }}
\newcommand{\inp}{{\bf Input}}
\newcommand{\N}{{\sf N}}
\newcommand{\simple}{1 }
\newcommand{\simplens}{1}


\section{Using lstlisting}

\begin{lstlisting}[mathescape,title={Program~\simple}]
$(x,y,z) = (\inp(\N),\inp(\N),\inp(\N))$
While $x>0$ and $y>0$ and $z>0$ 
	control := $\inp(1,2,3)$
	if control = 1
		$(x,y,z)=(x^2+10,y-x,z-10)$
	else
	if control = 2
		$(x,y,z)=(y^2+17,y-z^2,x-y)$
	else
	if control = 3
		$(x,y,z)=(y+17,xyz,x+y+z)$

\end{lstlisting}

\section{Using Obeylines}

\begin{obeylines}
Does this also obey indenting
            Lets find out
\end{obeylines}

\section{Using Verbatim}

\begin{verbatim}
Is this text Ugly?
          Does it indent?
\end{verbatim}

\section{Using enumerate without numbers}

\begin{enumerate}
\item[]
If this works then
\begin{enumerate}
\item[]
Give me an A on the HW
\item[]
Give me an A on the next HW
\end{enumerate}
\item[]
else
\begin{enumerate}
\item[]
Help me get it right.
\item[]
I hope my mistake enlightens me
\end{enumerate}
\end{enumerate}
\end{document}