print((function (f1, f2, g)
	local i,f=g()
	if f==0 then return tostring(i)..".0000000000" end
	if (f>0 and f>=1e10) or (f<0 and f<=-1e10) then return f1(i,f) end
	return f2(i,f)	
end)(function (i, f)
	local s=tostring(f)
	return tostring(i+tonumber(s:sub(1,#s-10))).."."..s:sub(#s-9)
end, function (i, f)
	if f>0 and i<0 then i,f = i+1,math.abs(f-1e10) end
	if f<0 and i>=0 then i,f = i-1,math.abs(f+1e10) end
	local s=tostring(f)
	return tostring(i).."."..string.rep("0",10-#s)..s
end, function ()
	local i,f=0,0
	for _=1,tonumber(io.stdin:read("*l")) do
		local a,b,c = io.stdin:read("*l"):match("(%-?)(%d+)%.?(%d*)")
		b,c = tonumber(b),(#c~=0 and tonumber(c..string.rep("0",10-#c)) or 0)
		if a=="" then i,f=i+b,f+c else i,f=i-b,f-c end
	end
	return i,f
end))