import math
n = int(input())
print((math.ceil(n/2))/n) import math math n = int(input()) n int(input()) int input() input print((math.ceil(n/2))/n) print (math.ceil(n/2))/n math.ceil(n/2) math.ceil math ceil n/2 n 2 n n = int(input()) int(input()) n
import math
n = int(input())
print((math.ceil(n/2))/n)