My 40 years of age don't help me ,so here is my quest:

One column with blanks, zeros, one digit numbers,not specific order. Eg:

A B

1 2

2

3

4 1

5 4

6

7 0

8

9

10 2

11

12 4

13

14

15 1

16

17

18

19 3

20 0

etc.

I want at B1 to sum the real six entries from A1 And below(not counting blanks, in above 2+1+4+0+2+4=13).,then copy paste it down.At B2 and B3 will be blank(could be done with 'IF(A2="";"";....my querry here...) but at B4 will be the sum from A4 and below (six real enties, in the example above cells A4,A5,A7,A10,A12,A15 >>1+4++0+2+4+1=12)

Many thanks, Alex