\documentclass{article} \usepackage{tikz} \newcommand{\n}{3} \begin{document} \begin{tikzpicture} \pgfmathparse{\n-1} \foreach \i in {0,...,\pgfmathresult}{ \draw (\i,0) circle (0.5); } \end{tikzpicture} \end{document}\end{document} ![alt text][1] [1]: https://texnique.fr/osqa/upfiles/Screen_Shot_2021-03-19_at_16.57.55.png

\documentclass{article} \usepackage{tikz} \newcommand{\n}{3} \begin{document} \begin{tikzpicture} \pgfmathparse{\n-1} \foreach \i in {0,...,\pgfmathresult}{ \draw (\i,0) circle (0.5); } \end{tikzpicture} \end{document}