from math import floor

from fractions import Fraction

from decimal import Decimal





def com_interest(n: int) -> int:

    saving = Decimal(100)

    interest_per = 0.01

    years = 0



    while True:

        years += 1

        b = Decimal('1.01')

        saving = int(saving) * b

        if saving >= n:

            break

    return years





print((com_interest(int(eval(input())))))
from decimal import Decimal





def com_interest(n: int) -> int:

    saving = Decimal('100')

    interest_per = 0.01

    years = 0



    while True:

        years += 1

        saving = int(saving * Decimal('1.01'))

        if saving >= n:

            break

    return years





print((com_interest(int(eval(input())))))

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


def com_interest(n: int) -> int:
    saving = Decimal(100)
    interest_per = 0.01
    years = 0
    while True:
        years += 1
        b = Decimal("1.01")
        saving = int(saving) * b
        if saving >= n:
            break
    return years


print((com_interest(int(eval(input())))))

from decimal import Decimal


def com_interest(n: int) -> int:
    saving = Decimal("100")
    interest_per = 0.01
    years = 0
    while True:
        years += 1
        saving = int(saving * Decimal("1.01"))
        if saving >= n:
            break
    return years


print((com_interest(int(eval(input())))))

-from math import floor -from fractions import Fraction -    saving = Decimal(100) +    saving = Decimal("100") -        b = Decimal("1.01") -        saving = int(saving) * b +        saving = int(saving * Decimal("1.01"))