Convert IBI WebFocus NESTED IF THEN ELSE into SSIS IF THEN ELSE

Need a little help converting IBI WebFocus nested if-else into SSIS if-else logic. Thanks

 IF ABC_Code_1 = 'Y' THEN                                
    (IF  ABC_Code_2 = 'N' THEN ZZZ_2                                 
    ELSE (IF  ABC_Code_3 = 'N' THEN  ZZZ_3                                 
    ELSE (IF  ABC_Code_4 = 'N' THEN  ZZZ_4                                 
    ELSE (IF  ABC_Code_5 = 'N' THEN  ZZZ_5 ELSE MISSING)))                           
    )ELSE ZZZ_1