n = int(input())
even =  n // 2
odd = n - even
print(odd/n) n = int(input()) n int(input()) int input() input even =  n // 2 even n // 2 n 2 odd = n - even odd n - even n even print(odd/n) print odd/n odd n even =  n // 2 n // 2 even odd = n - even n - even odd n = int(input()) int(input()) n
n = int(input())
even =  n // 2
odd = n - even
print(odd/n)
