def taumBday(b, w, bc, wc, z):
    # Write your code here
    res= (w*wc) + (b*bc)
    should_convert = z < abs(bc-wc)
    if should_convert:
        if bc-wc > 0:
            bc = wc+z
            return (w*wc) + (b*bc)
        if wc-bc > 0:
            wc = bc+z
            return (w*wc) + (b*bc)  
    return res