import java.util.Scanner;

/**
 * Main
 */
public class Main {

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

        long X = sc.nextLong();
        long count = 0;
        double Yokin = 100;
        double Kinri = 1.01;

        while (Yokin < X) {
            Yokin = Yokin*Kinri;
            Yokin = Math.floor(Yokin);
            count++;
        }
        System.out.println(count);
    }
} 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 count = 0;
        double Yokin = 100;
        double Kinri = 1.01;

        while (Yokin < X) {
            Yokin = Yokin*Kinri;
            Yokin = Math.floor(Yokin);
            count++;
        }
        System.out.println(count);
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        long X = sc.nextLong();
        long count = 0;
        double Yokin = 100;
        double Kinri = 1.01;

        while (Yokin < X) {
            Yokin = Yokin*Kinri;
            Yokin = Math.floor(Yokin);
            count++;
        }
        System.out.println(count);
    } main {
        Scanner sc = new Scanner(System.in);

        long X = sc.nextLong();
        long count = 0;
        double Yokin = 100;
        double Kinri = 1.01;

        while (Yokin < X) {
            Yokin = Yokin*Kinri;
            Yokin = Math.floor(Yokin);
            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 long count = 0; count 0 double Yokin = 100; Yokin 100 double Kinri = 1.01; Kinri 1.01 while (Yokin < X) {
            Yokin = Yokin*Kinri;
            Yokin = Math.floor(Yokin);
            count++;
        } Yokin < X Yokin X {
            Yokin = Yokin*Kinri;
            Yokin = Math.floor(Yokin);
            count++;
        } Yokin = Yokin*Kinri Yokin Yokin*Kinri Yokin Kinri Yokin = Math.floor(Yokin) Yokin Math.floor(Yokin) Math.floor Math Yokin 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 sc = new Scanner(System.in);

        long X = sc.nextLong();
        long count = 0;
        double Yokin = 100;
        double Kinri = 1.01;

        while (Yokin < X) {
            Yokin = Yokin*Kinri;
            Yokin = Math.floor(Yokin);
            count++;
        }
        System.out.println(count);
    }
} public class Main {

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

        long X = sc.nextLong();
        long count = 0;
        double Yokin = 100;
        double Kinri = 1.01;

        while (Yokin < X) {
            Yokin = Yokin*Kinri;
            Yokin = Math.floor(Yokin);
            count++;
        }
        System.out.println(count);
    }
} Main
import java.util.Scanner;

/**
 * Main
 */
public class Main {

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

        long X = sc.nextLong();
        long count = 0;
        double Yokin = 100;
        double Kinri = 1.01;

        while (Yokin < X) {
            Yokin = Yokin*Kinri;
            Yokin = Math.floor(Yokin);
            count++;
        }
        System.out.println(count);
    }
}