Thought maths was easy

A friend and I recently started playing Start Ocean 3 Till The End Of Time. The game was pretty fun, though it was freakin hard to navigate through the Kirsla Caverns and the Shrine of Kaddan.

One cool thing was damage counting. Somewhere near firewall and the spiral tower, the damage that can be dealt out reaches 100,000. Usually split into 10+ hit attacks. As can be seen:

.

Ever wonder how they do it?

PS. If you can count the total damage done, I'll get you a PS2