Are you saying that
Cell 1 contains the formula =IF(OR(L3>1,),0,K3) which currently shows value 5 and you want it to show 0 there if there is a number in cell 2 ?
If that is the case, lets say cell 2 is A2 and cell 1 is A1
change your formula to
=IF(ISNUMBER(a2), 0, IF(OR(L3>1,),0,K3) )
Basically saying if A2 is a number then show in a1 0, else show what used to be there as per your old formula