n = int(input())
odd = n//2 + n%2
print(odd/n) n = int(input()) n int(input()) int input() input odd = n//2 + n%2 odd n//2 + n%2 n//2 n 2 n%2 n 2 print(odd/n) print odd/n odd n n = int(input()) int(input()) n odd = n//2 + n%2 n//2 + n%2 odd
n = int(input())
odd = n//2 + n%2
print(odd/n)
