func main()
	var s: []char :: cui@input()
	var a: int :: s[0] $ int - '0' $ int
	var b: int :: s[1] $ int - '0' $ int
	var c: int :: ^s - 1
	if(s[2] > '4')
		do b :+ 1
		if(b = 10)
			do a :+ 1
			do b :: 0
			if(a = 10)
				do a :: 1
				do c :+ 1
			end if
		end if
	end if
	do cui@print("\{a}.\{b}*10^\{c}\n")
end func