\documentclass[a4paper,10pt]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage[french]{babel}
\usepackage[linesnumbered, french]{algorithm2e}

\begin{document}

\begin{algorithm}
$n \leftarrow0 $ \;
$u \leftarrow 3081,45 $ \;
\Tq{$u<k$}{
$u \leftarrow 1,04 \times u $ \;
$n \leftarrow n+1 $ \;
}
\end{algorithm}

\end{document}