How to edit the length of margins

Question

I want to decrease the length of margins, which are denoted on the picture (because i fint them too long). How can i do that?

\documentclass[12pt]{article}
\usepackage[utf8]{inputenc}
\usepackage[english,russian]{babel}
\usepackage[T1]{fontenc}
\usepackage{graphicx, graphics}
\usepackage{epsfig}
\usepackage{stmaryrd}
\usepackage{amssymb}
\usepackage{amsthm}
\usepackage{amsmath}
\pagestyle{empty}

\begin{document}
\title{ticket9}
\author{myname}

\section{introduction}
\vskip 0.1 cm
Some text

\end{document}