lastragcount = 0
function thinkShit()
	local ragcount = 0
	for i=1,4096 do
		local ent = ents.GetByIndex(i)
		if ent:IsValid() then
			if ent:GetClass() == "prop_ragdoll" then
				ragcount = ragcount + 1
			end
		end
	end
	if ragcount > lastragcount then
		--do your shit here
	end
	lastragcount = ragcount
end