\documentclass[12pt]{article}
\usepackage[polish]{babel}
\usepackage{float}
\usepackage{listings}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{pdfpages}
\usepackage[T1]{fontenc} % Add this line
    \title{Sprawozdanie z projektu MOM}
    \author{Krzysztof Rudnicki, 307585}
    \date{\today}
\begin{document}

\maketitle
	\input{sections/01-zadanie-1-siec-przeplywowa}
	\input{sections/02-zadanie-2-zadanie-przydzialu}
	\input{sections/03-zadanie-3}
\end{document}