import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long x = sc.nextLong();
        long yokin = 100;
        long n = 0;

        while (yokin < x) {
            yokin = (long) ((double) yokin * 1.01);
            n++;
        }

        System.out.print(n);
    }
} 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 yokin = 100;
        long n = 0;

        while (yokin < x) {
            yokin = (long) ((double) yokin * 1.01);
            n++;
        }

        System.out.print(n);
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long x = sc.nextLong();
        long yokin = 100;
        long n = 0;

        while (yokin < x) {
            yokin = (long) ((double) yokin * 1.01);
            n++;
        }

        System.out.print(n);
    } main {
        Scanner sc = new Scanner(System.in);
        long x = sc.nextLong();
        long yokin = 100;
        long n = 0;

        while (yokin < x) {
            yokin = (long) ((double) yokin * 1.01);
            n++;
        }

        System.out.print(n);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) long x = sc.nextLong(); x sc.nextLong() sc.nextLong sc long yokin = 100; yokin 100 long n = 0; n 0 while (yokin < x) {
            yokin = (long) ((double) yokin * 1.01);
            n++;
        } yokin < x yokin x {
            yokin = (long) ((double) yokin * 1.01);
            n++;
        } yokin = (long) ((double) yokin * 1.01) yokin (long) ((double) yokin * 1.01) (double) yokin 1.01 n++ n System.out.print(n) System.out.print System.out System System.out n String[] args args public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long x = sc.nextLong();
        long yokin = 100;
        long n = 0;

        while (yokin < x) {
            yokin = (long) ((double) yokin * 1.01);
            n++;
        }

        System.out.print(n);
    }
} public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long x = sc.nextLong();
        long yokin = 100;
        long n = 0;

        while (yokin < x) {
            yokin = (long) ((double) yokin * 1.01);
            n++;
        }

        System.out.print(n);
    }
} 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 yokin = 100;
        long n = 0;

        while (yokin < x) {
            yokin = (long) ((double) yokin * 1.01);
            n++;
        }

        System.out.print(n);
    }
}