# Insert numbers below each column of a histogram

I am trying to plot a histogram by below lines

\documentclass[tikz]{standalone}
\begin{document}
\begin{tikzpicture}[>=stealth]
\draw[<-] (7,0) node[below] {$x$} -- (-.5,0);
\draw[->] (0,-.5) -- (0,7) node[left] {$y$};
\draw (0,0) grid (6,1)  (1,1) grid (2,6)  (3,1) grid (4,5) (4,1)
rectangle (5,2);

\end{tikzpicture}
\end{document}


whose extracted output is as Fig.1 (of course without the red numbers below x axis).

How do I insert red numbers by latex (not paint) exactly below each column, however they are not starting with 1. Instead, they begin for example from 11 here.

\documentclass[tikz]{standalone}
\draw[<-] (7,0) node[below] {$x$} -- (-.5,0);
\draw[->] (0,-.5) -- (0,7) node[left] {$y$};
\path[red] (\i-9.5,0) node[below] {$\i$};