i keep gettinh incorrect error

A project has 92 activities, but only 13 of them are analyzed here. Activity P, 9 days, IP = not given Activity W, 6 days, IP = not given Activity S, 7 days, IP = not given Activity A, 16 days, IP = P, W Activity F, 27 days, IP = W, S Activity N, 22 days, IP = S Activity E, 49 days, IP = A Activity M, 40 days, IP = A, F Activity B, 9 days, IP = N Activity H, 8 days, IP = E, M Activity K, 13 days, IP = E, M, B Activity D, 5 days, IP = B Activity R, 9 days, IP = B It has been calculated that LS(K) = 114, LS(D) = 116, LS(H) = 110, LS(R) = 120. What is LS(A)