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: 83ms
Memory: 24436kB
Author: dszxlijun
In contest: 1122 
t=0
while True:
    s=100
    t = int(input())
    if t == 0:
        break
    s = s*0.7**t
    print('%.2f'%s)