import java.util.Scanner;

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

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

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

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

        long X = sc.nextLong();
        int count = 0;
        double money = 100;
        while (money < X) {
            money += money/100;
            money = Math.floor(money);
            count++;
        }
        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();
        int count = 0;
        double money = 100;
        while (money < X) {
            money += money/100;
            money = Math.floor(money);
            count++;
        }
        System.out.println(count);
    }
}