N = int(input())

O = [i for i in range(1, N+1) if i % 2 == 1]

print(len(O) / N) N = int(input()) N int(input()) int input() input i for i in range(1, N+1) if i % 2 == 1 for i in range(1, N+1) if i % 2 == 1 i range(1, N+1) range 1 N+1 N 1 i % 2 == 1 i % 2 i 2 1 if i % 2 == 1 i O = [i for i in range(1, N+1) if i % 2 == 1] O [i for i in range(1, N+1) if i % 2 == 1] print(len(O) / N) print len(O) / N len(O) len O N N = int(input()) int(input()) N O = [i for i in range(1, N+1) if i % 2 == 1] [i for i in range(1, N+1) if i % 2 == 1] O
N = int(input())

O = [i for i in range(1, N+1) if i % 2 == 1]

print(len(O) / N)