from decimal import Decimal,getcontext
getcontext().prec=100
X=Decimal(input())
Y=set()
ans=0
while X not in Y and X>10**-50:
    Y.add(X)
    ans+=1
    X=pow(X,-1)
    X%=1
if X in Y:
    print("infy")
else:
    print(ans)