#!/usr/bin/env python3

n = int(input())

sup = n % 2
odd_num = n//2+sup
even_num = n//2

print(odd_num/(even_num+odd_num)) n = int(input()) n int(input()) int input() input sup = n % 2 sup n % 2 n 2 odd_num = n//2+sup odd_num n//2+sup n//2 n 2 sup even_num = n//2 even_num n//2 n 2 print(odd_num/(even_num+odd_num)) print odd_num/(even_num+odd_num) odd_num even_num+odd_num even_num odd_num even_num = n//2 n//2 even_num n = int(input()) int(input()) n odd_num = n//2+sup n//2+sup odd_num sup = n % 2 n % 2 sup
#!/usr/bin/env python3

n = int(input())

sup = n % 2
odd_num = n//2+sup
even_num = n//2

print(odd_num/(even_num+odd_num))
