URGENT - what do I write in line 30 if I didn't get stimulus payments 1 & 2?

Sorry to be 'urgent' I'm trying to get this done to get today's postmark. What do I write in line 30 of the 1040 if I didn't receive the first two stimulus checks? Do I write 0 because I received nothing, or do I write in the amount I should have received (in my case 1800)?

Thank you!

I think this link will take you directly to the worksheet for Line 30:  https://www.irs.gov/instructions/i1040gi#en_US_2020_publink100048102

Found this in a Washington Post article:

What exactly do I put on Line 30?
You will only fill in the amount of the total credit you are due from either the first or second round or both. If you received a partial payment you would include the balance of the credit you are owed.

https://www.washingtonpost.com/business/2021/02/09/stimulus-payment-line-30-1040-tax-form/

I think this link will take you directly to the worksheet for Line 30:  https://www.irs.gov/instructions/i1040gi#en_US_2020_publink100048102

Thanks, that was a bit confusing to work through, but I now have a figure to enter into line 30. Thanks! I may just make the deadline!