Definition: In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Input: Teacher:  I 'm ashamed of you . When I was your age I could name all the presidents .
Junior: Yeah , but when you was my age there was only _ 4 _ of them .

presidents