Deleting units allocated in a range of cells based on the cell rank

I will try to explain the best way I can, the attached table makes it easier to visualize.

I have 10 buckets that I am naming from A to J (bucket A, bucket B, etc). Each bucket is ranked from #1 to #10, #1 being the most important bucket, #10 the least important one. Each bucket has 0, 1, 2 or 3 balls inside. There are a total of 10 balls all together inside the buckets. The table shows the number of balls each bucket has.

I need to take 3 balls out of the buckets beginning with the least important buckets first. Is there a formula I can enter in each cell highlighted in yellow to calculate the number of balls each cell should have at the end to accomplish a total of 7 balls inside the buckets?

Thanks.