Try this:
ON *!:JOIN:#:{
set -u4 %nickflood $+ $network $+ $chan $addtok(%nickflood [ $+ [ $network ] ] [ $+ [ $chan ] ],$nick,32)
hadd -mu10 joinflood $+($chan,@,$rand(0,99999999)) 1
if ($hfind(joinflood,$+($chan,@*),0,w).item >= 3) && ($me isop $chan) { .echo -a Join Flood on $chan }
}
Change echo -a Join Flood on $chan with whatever you want.
