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: 88ms
Memory: 24436kB
Author: wanghaha
In contest: 1122 
a=0
while True:
    s=100
    a=int(input())
    if a==0:
        break
    h=s*0.7**a
    print("%.2f"%h)