import java.util.Scanner;

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

        long money = 100;
        long cou = 0;
        while(money<X){
        money = money/100 + money;
            cou++;
        }
                System.out.println(cou);
        }
} import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args){
    
    Scanner sc = new Scanner(System.in);
        long X = sc.nextLong();

        long money = 100;
        long cou = 0;
        while(money<X){
        money = money/100 + money;
            cou++;
        }
                System.out.println(cou);
        }
} Main public static void main(String[] args){
    
    Scanner sc = new Scanner(System.in);
        long X = sc.nextLong();

        long money = 100;
        long cou = 0;
        while(money<X){
        money = money/100 + money;
            cou++;
        }
                System.out.println(cou);
        } main {
    
    Scanner sc = new Scanner(System.in);
        long X = sc.nextLong();

        long money = 100;
        long cou = 0;
        while(money<X){
        money = money/100 + money;
            cou++;
        }
                System.out.println(cou);
        } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) long X = sc.nextLong(); X sc.nextLong() sc.nextLong sc long money = 100; money 100 long cou = 0; cou 0 while(money<X){
        money = money/100 + money;
            cou++;
        } money<X money X {
        money = money/100 + money;
            cou++;
        } money = money/100 + money money money/100 + money money/100 money 100 money cou++ cou System.out.println(cou) System.out.println System.out System System.out cou String[] args args public class Main {
    public static void main(String[] args){
    
    Scanner sc = new Scanner(System.in);
        long X = sc.nextLong();

        long money = 100;
        long cou = 0;
        while(money<X){
        money = money/100 + money;
            cou++;
        }
                System.out.println(cou);
        }
} public class Main {
    public static void main(String[] args){
    
    Scanner sc = new Scanner(System.in);
        long X = sc.nextLong();

        long money = 100;
        long cou = 0;
        while(money<X){
        money = money/100 + money;
            cou++;
        }
                System.out.println(cou);
        }
} Main
import java.util.Scanner;

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

        long money = 100;
        long cou = 0;
        while(money<X){
        money = money/100 + money;
            cou++;
        }
                System.out.println(cou);
        }
}
