import sys

read = sys.stdin.buffer.read

readline = sys.stdin.buffer.readline

readlines = sys.stdin.buffer.readlines

sys.setrecursionlimit(10 ** 7)



from math import floor



x = int(readline())

v = 100

for i in range(x):

    v = floor(v * 1.01)

    if v >= x:

        print((i + 1))

        exit()

import sys

read = sys.stdin.buffer.read

readline = sys.stdin.buffer.readline

readlines = sys.stdin.buffer.readlines

sys.setrecursionlimit(10 ** 7)



from math import floor



x = int(read())

v = 100

for i in range(x):

    v = floor(v * 1.01)

    if v >= x:

        print((i + 1))

        exit()

import sys

read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
sys.setrecursionlimit(10**7)
from math import floor

x = int(readline())
v = 100
for i in range(x):
    v = floor(v * 1.01)
    if v >= x:
        print((i + 1))
        exit()

import sys

read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
sys.setrecursionlimit(10**7)
from math import floor

x = int(read())
v = 100
for i in range(x):
    v = floor(v * 1.01)
    if v >= x:
        print((i + 1))
        exit()

-x = int(readline()) +x = int(read())