Bottom chunk is 4 by 4, so that part has 16 blocks. The next one up is 4 by 3 so that one is 12 blocks. Second from the top is 4 by 2, this chunk has 8 blocks. The very top chunk is 2 by 1, this one has only 2 blocks.
1. Altogether there are 38 blocks. I added all the chunks together.
Does this give you a starting point? I don't want to give you the answer strait up. Think about it. I believe in you. Let me know if you need more help.