title: Go back to 2nd Previous Activity
body: <p>The question might be dumb but I'll ask it, for example I have 3 Activities, Activity 1,2,3.</p>
  
  <p>Activity 1, I click a button, goes to Activity 2
  Activity 2, I click a button, goes to Activity 3.
  Activity 3, I click the back button, I want it to go back to Activity 1. Any idea how to do it? Sorry Android Newbie. Thanks!</p>