I have a spreadsheet of the form:

Household Sales
1 1
1 0
1 1
2 0
2 0
3 1
3 1
3 1
etc, etc,

I am trying to find the total number of sales for each specific household
and as my spreadsheet is very large i'd prefer not to do it manually. I have
tried using a SUMIF function, but I can't manipulate the 'criteria' section
of the function such that I can set it equal to the value of a specific cell
- I can only seem to manually enter in the specific household identity
number.

Is there anyway to alter the SUMIF function (or indeed do it a different
way) that will allow me to do this calculation quickly.

Thanks