Your grandpa is a tricky one! He's always mixing up his pill bottles, and his prescription just keeps on changing. Below grandpa you'll see a number, which is the number you're trying to reach.
Every time you click on one of the four pill bottles, your total pills will go up by some amount (you better be keeping track for grandpa's sake!).
If you give grandpa too many pills, and your number is higher than his prescription, you lose. Better hit that number right on the money and help grandpa out!