It is really amazing that the great historian Dr.K has recently found that about 10 Million years ago, in the area where is now called China, lived an ancient people. They may be considered as the first intelligent creature existed on the earth.

As Dr.K's investigation advance, he found unbelievably that they even developed some so-called mathematics during their evolvement. Dr.K spent his half life to understand this ancient people's counting system. Finally he got to know that:
1、They use only 7 digits to represent numbers, and numbers are as follow:
| -> 1
|| -> 2
||| -> 3
|||| -> 4
||||| -> 5
|||||| -> 6
||||||| -> 7
It is a pity that they have not developed "0" before these people disappeared.
2、If a number is greater than 7, they use digit place just as we do today. Between each two digit places, there is a ",".
eg:
|||||