You are given a real number
x. Calculate
\(s = {{(x-1)\cdot(x-3)\cdot(x-7)\cdot ...\cdot(x-63)}\over{(x-2)\cdot(x-4)\cdot(x-8)\cdot...\cdot(x-64)}}\)< /span>
Input
A real number x (-50 <= x <= 50) is entered. It is guaranteed that a solution exists for the given x.
Imprint
Print the value S.