\documentclass[10pt]{scrartcl}
\usepackage{tikz}
\usetikzlibrary{positioning}

\begin{document}
\begin{tikzpicture}[node distance=2cm,bend angle=25,thick,main node/.style={circle,draw,inner sep=0.2cm}]
	\node[main node,label=above:3] (0) {};
	\node[main node,label=left:5] (1) [below of=0] {};
	\node[main node,label=below:3] (2) [below of=1] {};
	\node[main node,label=right:3] (3) [right=4cm of 1] {};
	\draw (0) to [bend left] (1);
	\draw (1) to [bend left] (0);
	\draw (1) to [bend left] (2);
	\draw (2) to [bend left] (1);
	\draw (0) to (3);
	\draw (2) to (3);
	\draw (1) to (3);
\end{tikzpicture}

\end{document}