on inventory click:

    if inventory name is "&1&l상점":

        cancel event

        if clicked item is not black stained glass pane:

            if click type is left mouse button:

                if clicked raw slot is smaller than 54:

                    set {_lore} to uncolored line 1 of lore of clicked item

                    replace all "매매가 " and ":" and " " and "원" with "" in {_lore}

                    set {_lore} to {_lore} parsed as integer

                    if {%player%.돈} is smaller than {_lore}:

                        message "&c돈이 부족합니다"

                        play sound "entity.experience_orb.pickup" with volume 0.5 and pitch 1 to the player

                    else:

                        set {_item} to clicked item

                        delete lore of {_item}

                        give {_item} to player

                        subtract {_lore} from {%player%.돈}

                        play sound "UI_BUTTON_CLICK" with volume 0.3 and pitch 3 to the player

            else if click type is right mouse button:

                if clicked raw slot is smaller than 54:

                    set {_lore} to uncolored line 1 of lore of clicked item

                    replace all "매매가 " and ":" and " " and "원" with "" in {_lore}

                    set {_lore} to {_lore} parsed as integer

                    set {_item} to clicked item

                    delete lore of {_item}

                    if player has 1 of {_item}:

                        remove 1 of {_item} from player's inventory

                        add {_lore} to {%player%.돈}

                        play sound "entity.experience_orb.pickup" with volume 0.5 and pitch 3 to the player

                    else:

                        message "&c현재 해당 아이템을 가지고 있지 않아 판매할 수 없습니다"

                        play sound "UI_BUTTON_CLICK" with volume 0.3 and pitch 3 to the player

현재 좌클릭으로 구매하고 우클릭으로 판매하는 것은 가능하나 1개씩만 가능한데 이거를 if click type is (right or left) mouse button with shift: 해가지고 64개씩 거래하게 하려면 어떻게 수정을 해야 될까요?