import java.util.Scanner;

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

        long X =  scanner.nextLong();
        long deposit = 100;
        int count = 0;

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

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

        long X =  scanner.nextLong();
        long deposit = 100;
        int count = 0;

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

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

        long X =  scanner.nextLong();
        long deposit = 100;
        int count = 0;

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

        System.out.println(count);
    } main {
        Scanner scanner = new Scanner(System.in);

        long X =  scanner.nextLong();
        long deposit = 100;
        int count = 0;

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

        System.out.println(count);
    } Scanner scanner = new Scanner(System.in); scanner new Scanner(System.in) long X =  scanner.nextLong(); X scanner.nextLong() scanner.nextLong scanner long deposit = 100; deposit 100 int count = 0; count 0 while(deposit < X) {
            deposit *= 1.01;
            count++;
        } deposit < X deposit X {
            deposit *= 1.01;
            count++;
        } deposit *= 1.01 deposit 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 scanner = new Scanner(System.in);

        long X =  scanner.nextLong();
        long deposit = 100;
        int count = 0;

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

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

        long X =  scanner.nextLong();
        long deposit = 100;
        int count = 0;

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

        System.out.println(count);
    }
} Main
import java.util.Scanner;

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

        long X =  scanner.nextLong();
        long deposit = 100;
        int count = 0;

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

        System.out.println(count);
    }
}
