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