N = float(input())
S = N
count = 0
while (N > 0):
  if N % 2 != 0:
    count += 1
  N = N - 1
print(count / S) N = float(input()) N float(input()) float input() input S = N S N count = 0 count 0 while (N > 0):
  if N % 2 != 0:
    count += 1
  N = N - 1 N > 0 N 0 if N % 2 != 0:
    count += 1
   N % 2 != 0 N % 2 N 2 0 count += 1 count 1 N = N - 1 N N - 1 N 1 print(count / S) print count / S count S count += 1 1 count count = 0 0 count S = N N S N = float(input()) float(input()) N N = N - 1 N - 1 N
N = float(input())
S = N
count = 0
while (N > 0):
  if N % 2 != 0:
    count += 1
  N = N - 1
print(count / S)