func main()
	var n: int :: 6
	var a: []int :: #[n]int
	for i(0, 5)
		do a[i] :: cui@inputInt()
	end for
	do a.sort()
	var ans: float :: (a[1] + a[2] + a[3] + a[4]) $ float / 4.0
	do cui@print("\{ans.toStrFmt(".2f")}\n")
end func