Here is a goal: How do you know you'll need to replenish your staple supply?

How would you accomplish this goal?

Pick from:
* Mark one end of 20 or so staples with a red sharpie pen. Load them so that red ones will be used at the end. When your stapler starts punching red, you need to buy staples..
* Mark one end of 20 or so staples with a red sharpie pen. Load them so that red ones will be used at first. When your stapler starts punching red, you need to buy staples..
Mark one end of 20 or so staples with a red sharpie pen. Load them so that red ones will be used at the end. When your stapler starts punching red, you need to buy staples.