there n student Polycarps class include a day ago student write essay my good friend each student essay dedicated student class hisher good friend Note student bs good friend necessarily student good friend bAnd teacher lead class museum history sport programming exciting story legendary hero await student tourist Petr tomek SnapDragon that s hear aboutthe teacher decide divide student pair pair consist student good friend she able split student pair problem wants pick maximum number pair if variant want pick pair boygirl pair possible of course student include pair