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: C
Result: Accepted
Time: 80ms
Memory: 24300kB
Author: Amber
In contest: 1122 
n=int(input())
while n!=0:
    print("%.2f"%(100*0.7**n))
    n=int(input())