Given a natural number
N, a real number
A. Calculate
\(P = A \cdot (A - N) \cdot (A - 2 \cdot N) \cdot... \cdot (A - N^2)\)
Input
The first line contains a natural number N (0<N<=10). The second line contains a real number A (-10< ;=A<=10).
Imprint
Output number P.