N = int(input())
print((N //2 + N % 2) / N) N = int(input()) N int(input()) int input() input print((N //2 + N % 2) / N) print (N //2 + N % 2) / N N //2 + N % 2 N //2 N 2 N % 2 N 2 N N = int(input()) int(input()) N
N = int(input())
print((N //2 + N % 2) / N)