n=int(input())

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

even=n//2
a=(n-even)/n
print(a)