i=0
x=[0 for k in range(0, 1000)]
y=[0 for k in range(0, 1000)]
a=int(raw_input())
x[i]=a
while x[i]!=0:
  i+=1
  a=int(raw_input())
  x[i]=a
for t in range(0,i):
  b=100*0.7**x[t]
  y[t]='%.2f' % b
  print y[t]