func main()
	var ss: [][]char :: cui@input().split(" ")
	var n: int :: ss[0].toInt(&)
	var g: int :: ss[1].toInt(&)
	var v: int :: ss[2].toInt(&)
	do n :/ 5
	var ans: float :: (g * n) $ float / v $ float
	do cui@print("\{ans.toStrFmt(".15f")}\n")
end func