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: Lucas 'Luke' Scott:  At this moment there are six billion , five hundred and two million , eight hundred and sixty seven thousand , one hundred and twenty people in the world , give or take a few and sometimes all you need is _ one _ . For better or for worse .

people