s = input()
a = ''
b = 1
dec = False
for c in s:
    if c == '.':
        dec = True
        continue
    if dec:
        b *= 10
    a += c
a = int(a)
if b == 1:
    print(min(2,a))
    exit()
cnt = 0
while b != 1 and a % b != 0:
    t = a
    a = b
    b = t
    a %= b
    cnt += 1
print(cnt)