Each bar tips toward the side with more turning force, and turning force is weight × notches from the pivot. Count the notches — the arms are never equal.

The four weights above are today's, but not which disc has which. You never find out directly; you only see which way things tip.

Tap two discs to swap their hooks. No swap can cost you the day — any arrangement is still reachable with three swaps left. Only spending your budget ends it.

There is no submit button. You win the moment all three bars hang level.