Start: Aug, 30, 2019 14:00:00
桐乡市求是实验中学八年级PYTHON教学
End: Jan, 01, 2020 18:00:00
Time elapsed:
Time remaining:

s=1+4+7+...100 2687

Time Limit:  1 s      Memory Limit:   256 MB
Submission：259     AC：227     Score：100

Description

s=1+4+7+...100

Input


Output

1717