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: 95ms
Memory: 24436kB
Author: szswzr
In contest: 1122 
n = 100 
sum = 0
counter =2
while counter <= n:
    sum = sum + counter
    counter += 2
 
print(sum)