Easy School

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    In first example, first teacher need 3 coins bribe to correct the marks and second teacher need 2 coins bribe or free to correct if he bribe 1 other teacher. But the explanation for first example says, if he bribe second teacher with 2 coins, first teacher will correct the marks for free. How it is as first teacher clearly saying he need 3 coins to correct the marks irrespective of bribing any other teachers as the value is '0'. Please explain.