import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);

        long money = 100;
        long X = s.nextLong() ;
        int count = 0;

        while(money<X){
            money = (long)Math.floor(money*1.01);
            count++;
        }

        System.out.println(count);

    }


} import java.util.*; util.* java public class Main {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);

        long money = 100;
        long X = s.nextLong() ;
        int count = 0;

        while(money<X){
            money = (long)Math.floor(money*1.01);
            count++;
        }

        System.out.println(count);

    }


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

        long money = 100;
        long X = s.nextLong() ;
        int count = 0;

        while(money<X){
            money = (long)Math.floor(money*1.01);
            count++;
        }

        System.out.println(count);

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

        long money = 100;
        long X = s.nextLong() ;
        int count = 0;

        while(money<X){
            money = (long)Math.floor(money*1.01);
            count++;
        }

        System.out.println(count);

    } Scanner s = new Scanner(System.in); s new Scanner(System.in) long money = 100; money 100 long X = s.nextLong() ; X s.nextLong() s.nextLong s int count = 0; count 0 while(money<X){
            money = (long)Math.floor(money*1.01);
            count++;
        } money<X money X {
            money = (long)Math.floor(money*1.01);
            count++;
        } money = (long)Math.floor(money*1.01) money (long)Math.floor(money*1.01) Math.floor Math money*1.01 money 1.01 count++ count System.out.println(count) System.out.println System.out System System.out count String[] args args public class Main {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);

        long money = 100;
        long X = s.nextLong() ;
        int count = 0;

        while(money<X){
            money = (long)Math.floor(money*1.01);
            count++;
        }

        System.out.println(count);

    }


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

        long money = 100;
        long X = s.nextLong() ;
        int count = 0;

        while(money<X){
            money = (long)Math.floor(money*1.01);
            count++;
        }

        System.out.println(count);

    }


} Main
import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);

        long money = 100;
        long X = s.nextLong() ;
        int count = 0;

        while(money<X){
            money = (long)Math.floor(money*1.01);
            count++;
        }

        System.out.println(count);

    }


}
