纸牌问题：

编号为1-52张牌，正面朝上，从第2张开始，以2为基数，是2的倍数的牌翻一次，直到最后一张牌；然后，从第3张开始，以3为基数，是3的倍数的牌翻一次，直到最后一张牌；然后.........一直下去，……从第51张牌开始，以51为基数，是51的倍数的牌翻一次，直到最后一张；从第52张牌开始，以52为基数，是52的倍数的牌翻一次，直到最后一张。

试编写程序，输出结束后正面向上的牌的序号。

-Solitaire problem:

　Numbered 1-52 cards, face up, from the first two base 2 is a multiple of 2 cards turning once, until the last card　then 3 of 3 as the base is a multiple of 3 cards turning once, until the last card　then ......... keep on going, ... from the 51 cards, 51 for the base, is a multiple of 51 cards turned time, until the last one　52 card 52 as the base, is a multiple of 52 cards turning once, until the last one.

Try to write the serial number of the program, the output after the end of the face up cards