I need some help for the below scenario,
- Sheet1 A2 has a date
- Sheet2 and Sheet3 has dates in column A and numbers in column B
example as below,

I want to get the sum value from Sheet2 & Sheet3 B column for all the values in Sheet1 A2 if finds in Sheet2 & Sheet3 A.
Below is my formula which I can get the sum from Sheet2 but not able to do with both sheet2 and sheet3.
{=SUM((Sheet2!$B$2:$B$65500)*(Sheet2!$A$2:$A$65500='Sheet1'!A2))}
Please help in formula or vba, thanks