ｉ　ａｍ　ｉｎｔｅｒｅｓｔｅｄ　ｉｎ　ｔｈｅ　ｂｒａｉｎ　ｔｅｅｓｅｒ，　ｂｕｔ　Ｉthink it is under-defined. Did the guy know how many leaves anytime, or he know it by counting. If he knows it anytime by perception, yes, then the answer is correct. But if he only knows it by counting, then if he doesn't know how many leaves you pulled off, how could he tell you the number then?