I think The largest possible value for S is 39
Because 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nó có trên mạng
Nghe giống mình chép trên mạng quá *chẹp chẹp* .... Nhưng xem thời gian họ họ gửi bài đuê ..... Nhỡ họ chép mình thì sao *cười tâm đắc*
@Duong Thi Nhuong TH Hoa Trach - Phong GD va DT Bo Trach