sentinel = "0"
a = []
for line in iter(input, sentinel):
    a.append(line)
i=0
for i in range(0,len(a)):  
    if int(a[i])>=1 and int(a[i])<=1000:
        cishu=1
        c=100
        while cishu<=int(a[i]):
            c=c*0.7
            cishu=cishu+1
        print('%.02f'%c)