Suppose that.1,.2,...,.n are positive numbers and n = 3. We want to know whether there exists a spherical metric on S2 with n conical singularities of angles 2p.1, 2p.2,..., 2p.n. A sufficient condition was obtained by Mondello and Panov (Int Math Res Not 2016(16): 4937-4995, 2016). We show that their condition is also necessary when we assume that theta(1), theta(2), ..., theta(n) is not an element of N.