import math, sequtils, strformat, strscans

const
  sumP = [2, 3, 5, 7, 11, 13].sum
  sumC = [4, 6, 8, 9, 10, 12].sum
let
  (_, p, c) = stdin.readAll.scanTuple "$i $i"
  list = sumP.repeat(p) & sumC.repeat(c)
var
  x = 1.0

for v in list:
  x = x * (v / 6)

echo &"{x:.12f}"