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