def main():
  N, p = input().split()
  N = int(N)
  p = float(p)
  q = 1 - p

  divs = [0 for _ in range(N + 5)]
  for i in range(2, N + 1):
    for j in range(i * 2, N + 1, i):
      divs[j] += 1

  ans = 0
  for i in range(2, N + 1):
    if divs[i] == 0:
      ans += 1
    else:
      ans += q**divs[i]

  print(ans)


if __name__ == "__main__":
  main()