## z:\Chao\src\1660_n+\test\in.txt 
2020/04/24 周五 13:47:20.56 
1
-----------------------------------------------
Process exited after 160 ms with return value 0

## z:\Chao\src\1660_n+\test\in2.txt 
2020/04/24 周五 13:47:20.56 
5050
-----------------------------------------------
Process exited after 80 ms with return value 0

## z:\Chao\src\1660_n+\test\in3.txt 
2020/04/24 周五 13:47:20.56 
500500
-----------------------------------------------
Process exited after 80 ms with return value 0