Evaluate integral integral S sqrt $1+$x$^2+$y$^2$ dS where S is the helicoid: r$($u$,$v$)=$ u sin$($v$)$I$+$ sin$($v$)$j$+$ vk$,$ with $0$ less than or equal to u less than or equal to $4,0,$ less than or equal to v$,$ less than or equal to $5$pi