SPSS: Calculate a new variable - people that match 3+ out of 12 variables?

I hope to explain this correctly.

I have 12 dichotomous variables (yes / no) for which I want to compute a new variable that includes those who answered Yes to 3 or more of those 12 variables.

I am a little soft programming these days, so I find it difficult to create an instruction (in a GUI - not like syntax)

Can anyone offer any help / guidance on how I can do this?

Many thanks.