Start: Nov, 12, 2017 10:00:00
2017秋Python程序设计基础培训第二次作业
End: Nov, 19, 2017 12:00:00
Time elapsed:
Time remaining:
Problem_ID: A
Result: Accepted
Time: 109ms
Memory: 24300kB
Author: cxf2017
In contest: 1122 
i=2
s=0
while i<=100:
    s=s+i
    i=i+2
print (s)