n = int(input())

if n % 2 != 0:
  print((int(n/2) + 1)/n)
else:
  print((n/2)/n)
 n = int(input()) n int(input()) int input() input if n % 2 != 0:
  print((int(n/2) + 1)/n)
else:
  print((n/2)/n) n % 2 != 0 n % 2 n 2 0 print((int(n/2) + 1)/n) print (int(n/2) + 1)/n int(n/2) + 1 int(n/2) int n/2 n 2 1 n print((n/2)/n) print (n/2)/n n/2 n 2 n n = int(input()) int(input()) n
n = int(input())

if n % 2 != 0:
  print((int(n/2) + 1)/n)
else:
  print((n/2)/n)

