You are given a multiset S. Over all pairs of subsets A and B, such that: . ВС 3; |B| = |A| – 1; greatest common divisor of all elements in A is equal to one; %3D find the sum of EPEA ª · · ExɛB®, modulo 998 244 353. xEB Input The first line contains one integer m (1 < m < 10°): the number of different values in the multiset S. Each of the next m lines contains two integers a;, freq; ( 1< a; < 10°, 1 < freq; < 10º). Element a; appears in the multiset S freq; times. All a; are different. Output Print the required sum, modulo 998 244 353.

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