N = int(input())

if N % 2 == 0:
    print((N//2)/N)
else:
    print(((N//2)+1)/N) N = int(input()) N int(input()) int input() input if N % 2 == 0:
    print((N//2)/N)
else:
    print(((N//2)+1)/N) N % 2 == 0 N % 2 N 2 0 print((N//2)/N) print (N//2)/N N//2 N 2 N print(((N//2)+1)/N) print ((N//2)+1)/N (N//2)+1 N//2 N 2 1 N N = int(input()) int(input()) N
N = int(input())

if N % 2 == 0:
    print((N//2)/N)
else:
    print(((N//2)+1)/N)