documentclass[tikz,border=3.14mm]{standalone}
begin{document}
begin{tikzpicture}
 draw[->] (0,0) -- (5.4,0);
 foreach X in {0,...,3}
  {draw[thick,-latex] (X,-0.1) node[below]{$X$} -- ++(0,0.6) node[above]{$1$};}
 draw[thick,-latex] (4.6,-0.1) node[below]{$n-1$} -- ++(0,0.6) node[above]{$1$};
 node at (3.8,0.4) {$cdots$};
end{tikzpicture}
end{document}