import java.io.*;
import java.math.*;

class Main
{
    public static void main(String args[])throws Exception
    {
        BufferedReader bu=new BufferedReader(new InputStreamReader(System.in));
        long n=Long.parseLong(bu.readLine());
        long p=100,t=0;
        while(p<n)
        {
            p=(long)Math.floor(1.0*p*(101.0/100));
            t++;
        }
        System.out.print(t);
    }
} import java.io.*; io.* java import java.math.*; math.* java class Main
{
    public static void main(String args[])throws Exception
    {
        BufferedReader bu=new BufferedReader(new InputStreamReader(System.in));
        long n=Long.parseLong(bu.readLine());
        long p=100,t=0;
        while(p<n)
        {
            p=(long)Math.floor(1.0*p*(101.0/100));
            t++;
        }
        System.out.print(t);
    }
} Main public static void main(String args[])throws Exception
    {
        BufferedReader bu=new BufferedReader(new InputStreamReader(System.in));
        long n=Long.parseLong(bu.readLine());
        long p=100,t=0;
        while(p<n)
        {
            p=(long)Math.floor(1.0*p*(101.0/100));
            t++;
        }
        System.out.print(t);
    } main {
        BufferedReader bu=new BufferedReader(new InputStreamReader(System.in));
        long n=Long.parseLong(bu.readLine());
        long p=100,t=0;
        while(p<n)
        {
            p=(long)Math.floor(1.0*p*(101.0/100));
            t++;
        }
        System.out.print(t);
    } BufferedReader bu=new BufferedReader(new InputStreamReader(System.in)); bu new BufferedReader(new InputStreamReader(System.in)) long n=Long.parseLong(bu.readLine()); n Long.parseLong(bu.readLine()) Long.parseLong Long bu.readLine() bu.readLine bu long p=100 p 100 t=0; t 0 while(p<n)
        {
            p=(long)Math.floor(1.0*p*(101.0/100));
            t++;
        } p<n p n {
            p=(long)Math.floor(1.0*p*(101.0/100));
            t++;
        } p=(long)Math.floor(1.0*p*(101.0/100)) p (long)Math.floor(1.0*p*(101.0/100)) Math.floor Math 1.0*p*(101.0/100) 1.0*p*(101.0/100) 1.0 p (101.0/100) 101.0 100 t++ t System.out.print(t) System.out.print System.out System System.out t String args[] args
import java.io.*;
import java.math.*;

class Main
{
    public static void main(String args[])throws Exception
    {
        BufferedReader bu=new BufferedReader(new InputStreamReader(System.in));
        long n=Long.parseLong(bu.readLine());
        long p=100,t=0;
        while(p<n)
        {
            p=(long)Math.floor(1.0*p*(101.0/100));
            t++;
        }
        System.out.print(t);
    }
}
