\documentclass{article}
\usepackage{a4wide}
\usepackage{msc}

\setlength{\instwidth}{3.0cm}
\setlength{\instdist}{4cm}
\setlength{\actionwidth}{3.6cm}
\setlength{\conditionoverlap}{1.9cm}

\begin{document}

\input{attack}

\end{document}