CF414B Mashmokh and ACM

Mashmokh's boss, Bimokh, didn't like Mashmokh. So he fired him. Mashmokh decided to go to university and participate in ACM instead of finding a new job. He wants to become a member of Bamokh's team. In order to join he was given some programming tasks and one week to solve them. Mashmokh is not a very experienced programmer. Actually he is not a programmer at all. So he wasn't able to solve them. That's why he asked you to help him with these tasks. One of these tasks is the following. A sequence of $ l $ integers $ b_{1},b_{2},...,b_{l} $ $ (1

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In the first sample the good sequences are: $ [1,1],[2,2],[3,3],[1,2],[1,3] $ .