N = int(input())

odd = (N+1)//2
print(odd/N) N = int(input()) N int(input()) int input() input odd = (N+1)//2 odd (N+1)//2 N+1 N 1 2 print(odd/N) print odd/N odd N odd = (N+1)//2 (N+1)//2 odd N = int(input()) int(input()) N
N = int(input())

odd = (N+1)//2
print(odd/N)
