from math import floor
from decimal import Decimal
from fractions import Fraction

ans = 0
X = Fraction(int(Decimal(input()) * 10**10), 10**10)
for _ in range(10**7):
    if X == 0:
        print(ans)
        break
    X = 1 / X
    X -= floor(X)
    ans += 1
else:
    print("infty")