\documentclass{../Lecture}
\usepackage{../preamble}

\begin{document}

\author{Андрей гущин}
\title{Теория информации}
\maketitle

\include{lectures/lecture1.tex}
\include{lectures/lecture2.tex}
\include{lectures/lecture3.tex}
\include{lectures/lecture4.tex}
\include{lectures/lecture5.tex}
\include{lectures/lecture6.tex}

\end{document}