Checkbox cell value, multiple IF formulae

I'm trying to correlate a checkbox with a number value as per below i.e. if D4 is TRUE then value shown in G4 = 3

So far I can get G4 =if(D4,3,0) to produce this but cannot apply the rule to the whole row

Is this a case of writing multiple IF formulae to one cell or something else?

enter image description here