\newif\ifimagen\imagentrue
\documentclass[american]{amsbook}
\usepackage[T1]{fontenc}
\usepackage[latin1]{inputenc}
\usepackage{graphicx}
\usepackage{amssymb}
\newtheorem{thm}{Theorem}[section]
\newcommand{\N}{\mathbb{N}}
\newcommand{\Z}{\mathbb{Z}}
\newcommand{\Q}{\mathbb{Q}}
\newcommand{\R}{\mathbb{R}}
\newcommand{\C}{\mathbb{C}}
\usepackage{hyperref}
\usepackage[francais,american]{babel}

\pagestyle{empty}
\thispagestyle{empty}
\begin{document}
\includegraphics[%
  width=0.5\textwidth]{maze1}
\clearpage% page: 0
\includegraphics[%
  width=0.5\textwidth]{maze2}
\clearpage% page: 1
\includegraphics[%
  width=1\textwidth]{maze-big}
\clearpage% page: 2
\includegraphics[%
  width=0.5\textwidth]{maze3}
\clearpage% page: 3
\includegraphics[%
  width=0.5\textwidth]{maze4}
\clearpage% page: 4

\end{document}
