How many teachers are in hall

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On occaasion of Teachers day-2017 at MJP Rohilakhand University. A celebration is in progress(in our own hall of CSIT Department). Hall consists of M rows of N seats in each row. Each of student and teacher have a knowledge level that can be represented by positive integer(higher the number higher is the knowledge of student/teacher). As it is time of Teachers Day all student wants to sit near t

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