a = int(input())
print( ((a+1)//2) / a) a = int(input()) a int(input()) int input() input print( ((a+1)//2) / a) print ((a+1)//2) / a (a+1)//2 a+1 a 1 2 a a = int(input()) int(input()) a
a = int(input())
print( ((a+1)//2) / a)