Add one more litre and do it again.
I don't think any man can carry more than 15 litres with his balls, so you wouldn't have more than 8 in there, that means you can actually make a couple of jumps :D
Come on... I won't make you do more than 3 and you don't have to jump high.
Just kidding, you are gonna give me 6 jumps, just lifting your feet a little is fine though.
Empty the bucket, and put 1 litre inside.