Continuous optimization

A correct solution is worth 1 point and 1 point per week need to be collected. If you fail to receive 1 point, then the gap can be redeemed by receiving the double of the deficit as extra points on another week.

Example: XY submits 1 exercises but the solutions is not completely correct, so XY gets 0.5 points. That means that on another week she has to receive at least 2 points in order to get the 2x0.5=1 extra point.