????:1???????????:???????????????

2?????

3?????

4?????????

5???????????

??,???????????????????????????,?????????????

???,??,?????6????????13????,???????,??????????,???????????????????????,???????????????????????????????????,??????

????????12??24??????????,???????????,???????,???????30???,??

??????????????22?????????55?,????,?,??????????????????????????????????????????????,?????????

(? ???????? ??? ? ???)

??????????:???????????????????