N = int(input())
print(((N >> 1) + (N & 1)) / N) N = int(input()) N int(input()) int input() input print(((N >> 1) + (N & 1)) / N) print ((N >> 1) + (N & 1)) / N (N >> 1) + (N & 1) N >> 1 N 1 N & 1 N 1 N N = int(input()) int(input()) N
N = int(input())
print(((N >> 1) + (N & 1)) / N)