Dear all good morning

i have a workbook with 4 sheets.
the first one has to consolidate the other 3

i am trying to create a formula by adding the three sheets. but the results
in not correct. there are 2000 rows with different account per sheet.

There is any possibility to say if B1 from sheet2 is equal with B1 from
sheet3 and equal with B1 from sheet 4 the add the respectivly cells from
each sheet, from column C.

I am quity comfuse because i mixing match formula with sumif and vlookup.

Can you please someone help me?

Thanks in advance
Manos