Start: Apr, 17, 2017 10:00:00
Python程序设计基础培训第二次作业
End: Apr, 23, 2017 14:00:00
Time elapsed:
Time remaining:
Problem_ID: C
Result: Accepted
Time: 120ms
Memory: 21432kB
Author: 13185240773
In contest: 1086 
n=1
while n!=0:
  n=int(raw_input())
  s=100*0.7**n
  if n!=0:print '%.2f' % s