\documentclass[12pt]{beamer}
\usetheme{Berlin}
\usepackage[utf8]{inputenc}
\usepackage[spanish]{babel}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{graphicx}
\usepackage{braket}

\usepackage{appendixnumberbeamer}

%\setbeamerfont{page number in head}{size=\large}
%\setbeamertemplate{footline}{Diapositiva}
\setbeamertemplate{footline}[frame number]

\newcommand{\backupbegin}{
  \newcounter{finalframe}
  \setcounter{finalframe}{\value{framenumber}}		
}

\newcommand{\backupend}{
  \setcounter{framenumber}{\value{finalframe}}
}

\author{Física Nuclear y subnuclear }
\title{Física Nuclear: extra modelos nucleares}
%\setbeamercovered{transparent} 
%\setbeamertemplate{navigation symbols}{} 
%\logo{} 
%\institute{} 
%\date{} 
%\subject{} 
\begin{document}

\begin{frame}
\titlepage
\end{frame}



%\begin{frame}{Contenido}
%	\tableofcontents
%\end{frame}

\end{document}
