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