N = int(input())

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

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