x = input()
if "." in x:
    idx = x.index(".")
    t = x[:idx]
    s = x[idx+1:]
    s = s + (9 - len(s)) * "0"
    a = int(t) * 10 ** 9 + int(s)
else:
    a = int(x) * 10 ** 9

b = 10 ** 9
cnt = 0
if a > b:
    a %= b
    cnt = 2
while a:
    s = b // a
    na = b - s*a
    nb = a
    cnt += 1
    a, b = na, nb
    if cnt == 1000000:
        print("infty")
        exit()

print(cnt)