How do I determine my Total 2021 economic impact payment? My husband and I each got a letter saying the amount was $2100. So should I have entered $2100 or $4200?

Both letters stated $2100 each so should I have entered the total of both letters ($4200) or $2100 in the box? I also double checked the government site and it said $2100 but the amount that was deposited within the timeframe of March through May was $4200. Thank you!