\documentclass[12pt,a4paper,oneside,twocolumn]{article}
\usepackage[T2A]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[english, russian]{babel}
\usepackage{olymp}
\usepackage{graphicx}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{epigraph}

\begin{document}

\renewcommand{\t}{\texttt}
\newcommand{\eps}{\varepsilon}
\renewcommand{\phi}{\varphi}
\newcommand{\pow}{\^\relax}
\newcommand{\bs}{\mbox{$\backslash$}}
\def\bbZ{\mathbb{Z}}

% commonize style:
\renewcommand{\leqslant}{\leq}

% Treat all pictures as MPS (metapost) when using PDFLaTeX tool
\ifx\pdftexversion\undefined
\else
  \DeclareGraphicsRule{*}{eps}{*}{}
\fi

\binoppenalty=10000
\relpenalty=10000

\contest
{}%
{Группа DJ}%
{Практическое занятие 6, среда, 11 ноября, 2009}%

\newcommand{\inputproblem}[1]{\input ../problems/#1/statement/#1.tex}

\inputproblem{flipper}
\inputproblem{trains}
\inputproblem{cat}

\end{document}
