You are given a perpetuity, with annual payments as follows: (i) Payments of 8 at the end of the first year and every three years thereafter. (ii) Payments of 4 at the end of the second year and every three years thereafter. (iii) Payments of 5 at the end of the third year and every three years thereafter. The interest is 10% convertible semiannually. Calculate the present value of this perpetuity.