n = int(input())
a = -1
if n % 2 == 1: a = (n + 1) // 2
else: a = n // 2
print(a / n) n = int(input()) n int(input()) int input() input a = -1 a -1 if n % 2 == 1: a = (n + 1) // 2
else: a = n // 2 n % 2 == 1 n % 2 n 2 1 print(a / n) print a / n a n a = -1 -1 a n = int(input()) int(input()) n
n = int(input())
a = -1
if n % 2 == 1: a = (n + 1) // 2
else: a = n // 2
print(a / n)