import java.util.Scanner;

public class Main {

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

        long sum = 100;
        int count = 0;
        do {
            sum = (long) (sum * 1.01);
            count++;

        } while (sum < X);

        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();
        sc.close();

        long sum = 100;
        int count = 0;
        do {
            sum = (long) (sum * 1.01);
            count++;

        } while (sum < X);

        System.out.println(count);

    }

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

        long sum = 100;
        int count = 0;
        do {
            sum = (long) (sum * 1.01);
            count++;

        } while (sum < X);

        System.out.println(count);

    } main {
        Scanner sc = new Scanner(System.in);
        long X = sc.nextLong();
        sc.close();

        long sum = 100;
        int count = 0;
        do {
            sum = (long) (sum * 1.01);
            count++;

        } while (sum < X);

        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 sc.close() sc.close sc long sum = 100; sum 100 int count = 0; count 0 do {
            sum = (long) (sum * 1.01);
            count++;

        } while (sum < X); sum < X sum X {
            sum = (long) (sum * 1.01);
            count++;

        } sum = (long) (sum * 1.01) sum (long) (sum * 1.01) sum 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 sc = new Scanner(System.in);
        long X = sc.nextLong();
        sc.close();

        long sum = 100;
        int count = 0;
        do {
            sum = (long) (sum * 1.01);
            count++;

        } while (sum < X);

        System.out.println(count);

    }

} public class Main {

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

        long sum = 100;
        int count = 0;
        do {
            sum = (long) (sum * 1.01);
            count++;

        } while (sum < X);

        System.out.println(count);

    }

} Main
import java.util.Scanner;

public class Main {

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

        long sum = 100;
        int count = 0;
        do {
            sum = (long) (sum * 1.01);
            count++;

        } while (sum < X);

        System.out.println(count);

    }

}
