incorrect result for 10 portion of wheat

hello, i think there is a bug - 10 portions of wheat should feed only 5 pidgeons, shouldn't? iterations: 1. 1 (feeded: 1, reamining wheat: 9) 2. 2 1 1 (feeded: 3, wheat: 6) 3. 3 2 2 1 1 (feeded: 5, wheat: 1) 4. 4 2 2 1 1 0 0 (feeded: 5, wheat 0)

or did i miss something? :)