Math Number Trick

It should work with any number. Doesn't matter anything as long as you put 3 digits for the first number and 4 digits for the second.

Here is the trick as Jason proved too.
answer = [{[(n*80)+1]*250}+2*y-250]/2;
= [{(n*80*250)+1*250}+2*y-250]/2;
= [n*80*250 + 250 + 2*y - 250]/2;
= [n*80*250 + 2*y]/2;
= n*40*250 + y;
= n*10000 + y;

So if n = 123 and y = 2345, then
answer = 1230000 + 2345 = 1232345

if n = 001 and y = 0879, then
answer = 0010000 + 0879 = 10879 = 0010879

So, strange?? yes or no :p