After looking through a telescope for too long, SAC's head prefect decided to look the other way: his new, inverted telescope will shrink all images by ~40~x.

Now that he has inverted the telescope, he decides to look at a rectangle on his wall that was already measured, but he cannot figure out the area of the rectangle after being shrunk.

Help him find the area of the rectangle after shrinking it through the telescope!

Input Specification

The first line will contain ~A~ ~(0 \le A \le 1\,000\,000\,000)~, the original area of the rectangle without magnification or shrinkage.

Note: ~A~ will always be a multiple of ~40~.

Output Specification

Output the area of the rectangle after shrinking it.

Sample Input

800

Sample Output

20