% variables
\logo{\includegraphics[height=7.5em]{../../cnam}}
\title[\titleshort]{\titlelong}
\subtitle{\titlesub}
\author[\authorshort]{\authorlong}
\institute[CNAM]{Conservatoire National des Arts et Métiers}
\date[\typeshort \dateshort]{\typelong\\\datelong}

\usetheme{Berkeley}
\usecolortheme{seahorse}
\usebackgroundtemplate{\includegraphics[width=\paperwidth]{../../paper}}

\beamertemplatenavigationsymbolsempty

\addtobeamertemplate{navigation symbols}{}{
\color{black}\normalsize\textbf\insertframenumber}