\documentclass[12pt,a4paper]{report}
\usepackage[pdftex]{graphicx}
\usepackage{url}
\usepackage[bookmarks, colorlinks=false, pdfborder={0 0 0}, pdftitle={<pdf title here>}, pdfauthor={<author's name here>}, pdfsubject={<subject here>}, pdfkeywords={<keywords here>}]{hyperref}
\begin{document}
\renewcommand\bibname{References}
\input{title}
\pagenumbering{roman}
\tableofcontents
\newpage
\pagenumbering{arabic}
\input{prob-definition}
\input{introduction}
\input{work-done}
\input{conclusion}
\input{acknow}
\end{document}
