N = int(input())
L = [i for i in range(1, N + 1) if i % 2 != 0]
A = len(L) / N
print(A) N = int(input()) N int(input()) int input() input i for i in range(1, N + 1) if i % 2 != 0 for i in range(1, N + 1) if i % 2 != 0 i range(1, N + 1) range 1 N + 1 N 1 i % 2 != 0 i % 2 i 2 0 if i % 2 != 0 i L = [i for i in range(1, N + 1) if i % 2 != 0] L [i for i in range(1, N + 1) if i % 2 != 0] A = len(L) / N A len(L) / N len(L) len L N print(A) print A N = int(input()) int(input()) N L = [i for i in range(1, N + 1) if i % 2 != 0] [i for i in range(1, N + 1) if i % 2 != 0] L A = len(L) / N len(L) / N A
N = int(input())
L = [i for i in range(1, N + 1) if i % 2 != 0]
A = len(L) / N
print(A)