import java.util.Scanner;

public class Main {
    public static void main(String[] args){
       Scanner sc = new Scanner(System.in);
       long f = 100;
       int answer = 0;
       long x = sc.nextLong();
       while(x > f){
           f += f / 100;
           answer++;
       }
       System.out.println(answer); 
    }
} import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args){
       Scanner sc = new Scanner(System.in);
       long f = 100;
       int answer = 0;
       long x = sc.nextLong();
       while(x > f){
           f += f / 100;
           answer++;
       }
       System.out.println(answer); 
    }
} Main public static void main(String[] args){
       Scanner sc = new Scanner(System.in);
       long f = 100;
       int answer = 0;
       long x = sc.nextLong();
       while(x > f){
           f += f / 100;
           answer++;
       }
       System.out.println(answer); 
    } main {
       Scanner sc = new Scanner(System.in);
       long f = 100;
       int answer = 0;
       long x = sc.nextLong();
       while(x > f){
           f += f / 100;
           answer++;
       }
       System.out.println(answer); 
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) long f = 100; f 100 int answer = 0; answer 0 long x = sc.nextLong(); x sc.nextLong() sc.nextLong sc while(x > f){
           f += f / 100;
           answer++;
       } x > f x f {
           f += f / 100;
           answer++;
       } f += f / 100 f f / 100 f 100 answer++ answer System.out.println(answer) System.out.println System.out System System.out answer String[] args args public class Main {
    public static void main(String[] args){
       Scanner sc = new Scanner(System.in);
       long f = 100;
       int answer = 0;
       long x = sc.nextLong();
       while(x > f){
           f += f / 100;
           answer++;
       }
       System.out.println(answer); 
    }
} public class Main {
    public static void main(String[] args){
       Scanner sc = new Scanner(System.in);
       long f = 100;
       int answer = 0;
       long x = sc.nextLong();
       while(x > f){
           f += f / 100;
           answer++;
       }
       System.out.println(answer); 
    }
} Main
import java.util.Scanner;

public class Main {
    public static void main(String[] args){
       Scanner sc = new Scanner(System.in);
       long f = 100;
       int answer = 0;
       long x = sc.nextLong();
       while(x > f){
           f += f / 100;
           answer++;
       }
       System.out.println(answer); 
    }
}