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Riddle answer consists of 3 characters

There are five birds in a tree, eight on a roof, and seven on the ground. All birds in the tree lay one egg, so do half of the birds on the roof. The birds on the ground get food, but got scared and flew away. There is also James the Seagull, his partner lays 5 eggs. How many birds left after a full year? (Answer in three digits, e.g. 003 or 018)