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: 90ms
Memory: 24436kB
Author: zzzhangxd
In contest: 1122 
while True:      
    n=int(input())
    if n==0:
	    break
    else:
	    s=100*0.7**n
	    print( '%.2f' % s)