Finn solved several math word problems involving adding quantities. He started with 603 books and got 40 more, solving for 643 total. Then he started with 673 fogs and added 598 more, solving for 1271 total. Next, he started with 1973 aliens and added 9456 more, solving for 11429 total. Finally, he started with 9149 birds and added 9458 more, solving for 18607 total.