\documentclass[a4paper,11pt]{article}
\usepackage[utf8]{inputenc}
\usepackage{amsfonts,amssymb,amsmath}
\topmargin-2cm
\textheight24cm
\oddsidemargin0cm
\textwidth15cm

\title{Title}
\author{First name and Surname\\ \small{Institution, City}}
\date{}

\begin{document}
\maketitle
\thispagestyle{empty}

Text of the abstract.

\end{document}