import java.io.BufferedReader;
import java.io.*;
import java.util.*;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Collections;

public class Main {
	public static void main(final String[] args){
    
        Scanner sc = new Scanner(System.in);

        long x = sc.nextLong();

        double a = 100;
        long k = 0;
        int count = 0;

        double rate = 1.01;
        
        while(x > a){
            a = rate * a;
            k = (long)a;
            a = (double)k;
            count++;
        }
        System.out.println(count);


        
        






    }
} import java.io.BufferedReader; BufferedReader java.io import java.io.*; io.* java import java.util.*; util.* java import java.util.ArrayList; ArrayList java.util import java.util.Iterator; Iterator java.util import java.util.List; List java.util import java.util.Collections; Collections java.util public class Main {
	public static void main(final String[] args){
    
        Scanner sc = new Scanner(System.in);

        long x = sc.nextLong();

        double a = 100;
        long k = 0;
        int count = 0;

        double rate = 1.01;
        
        while(x > a){
            a = rate * a;
            k = (long)a;
            a = (double)k;
            count++;
        }
        System.out.println(count);


        
        






    }
} Main public static void main(final String[] args){
    
        Scanner sc = new Scanner(System.in);

        long x = sc.nextLong();

        double a = 100;
        long k = 0;
        int count = 0;

        double rate = 1.01;
        
        while(x > a){
            a = rate * a;
            k = (long)a;
            a = (double)k;
            count++;
        }
        System.out.println(count);


        
        






    } main {
    
        Scanner sc = new Scanner(System.in);

        long x = sc.nextLong();

        double a = 100;
        long k = 0;
        int count = 0;

        double rate = 1.01;
        
        while(x > a){
            a = rate * a;
            k = (long)a;
            a = (double)k;
            count++;
        }
        System.out.println(count);


        
        






    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) long x = sc.nextLong(); x sc.nextLong() sc.nextLong sc double a = 100; a 100 long k = 0; k 0 int count = 0; count 0 double rate = 1.01; rate 1.01 while(x > a){
            a = rate * a;
            k = (long)a;
            a = (double)k;
            count++;
        } x > a x a {
            a = rate * a;
            k = (long)a;
            a = (double)k;
            count++;
        } a = rate * a a rate * a rate a k = (long)a k (long)a a = (double)k a (double)k count++ count System.out.println(count) System.out.println System.out System System.out count final String[] args args public class Main {
	public static void main(final String[] args){
    
        Scanner sc = new Scanner(System.in);

        long x = sc.nextLong();

        double a = 100;
        long k = 0;
        int count = 0;

        double rate = 1.01;
        
        while(x > a){
            a = rate * a;
            k = (long)a;
            a = (double)k;
            count++;
        }
        System.out.println(count);


        
        






    }
} public class Main {
	public static void main(final String[] args){
    
        Scanner sc = new Scanner(System.in);

        long x = sc.nextLong();

        double a = 100;
        long k = 0;
        int count = 0;

        double rate = 1.01;
        
        while(x > a){
            a = rate * a;
            k = (long)a;
            a = (double)k;
            count++;
        }
        System.out.println(count);


        
        






    }
} Main
import java.io.BufferedReader;
import java.io.*;
import java.util.*;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Collections;

public class Main {
	public static void main(final String[] args){
    
        Scanner sc = new Scanner(System.in);

        long x = sc.nextLong();

        double a = 100;
        long k = 0;
        int count = 0;

        double rate = 1.01;
        
        while(x > a){
            a = rate * a;
            k = (long)a;
            a = (double)k;
            count++;
        }
        System.out.println(count);


        
        






    }
}