In this interesting battle, you have to defend your own blue diamonds that you stole a huge flock of birds. The battle is interesting in that it will be able to win only one who has mathematical abilities. Look carefully at their abusers, birds and try to eliminate those who encroach on your jewelry. These are not simple, because the cannon shot poisoned arrows only when the sum of the numbers on it and the number on one of the birds will coincide povsevmestno.
