i=0
n=input()
list = []
list.append(n)
while list[i]!=0:
	i=i+1
	n=input()
	list.append(n)
for x in range(0,i):
	j=list[x]
	m=100.00
	for y in range(1,j+1):
		m=m*0.7
	print "%.2f" % m