Each gamer has an army of units. Write a program that classifies the army of your enemies in accordance with these rules:
Units: Category
less than 1: no army
from 1 to 4: few
from 5 to 9: several
from 10 to 19: pack
from 20 to 49: lots
from 50 to 99: horde
from 100 to 249: throng
from 250 to 499: swarm
from 500 to 999: zounds
1000 and more: legion
The program should read the number of units and output the corresponding category.