Looking for computer engineers!

While randomly surfing the web this morning, I stumbled on this funny job ad. Can you solve the problem? It’s really not that difficult by the way!

x = 24;
y = 30;

Phone:= 01.(y^2 – x)-(y^2-10^2)*10

Oh and by the way, don’t try calling the number. This ad dates back a couple of years and it’s not in a North American format ((xxx)xxx-xxxx).