import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long k = sc.nextLong();
        long total = 100;
        int count = 0;
        while(total < k) {
            total *= 1.01;
            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 k = sc.nextLong();
        long total = 100;
        int count = 0;
        while(total < k) {
            total *= 1.01;
            count++;
        }
        System.out.println(count);
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long k = sc.nextLong();
        long total = 100;
        int count = 0;
        while(total < k) {
            total *= 1.01;
            count++;
        }
        System.out.println(count);
    } main {
        Scanner sc = new Scanner(System.in);
        long k = sc.nextLong();
        long total = 100;
        int count = 0;
        while(total < k) {
            total *= 1.01;
            count++;
        }
        System.out.println(count);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) long k = sc.nextLong(); k sc.nextLong() sc.nextLong sc long total = 100; total 100 int count = 0; count 0 while(total < k) {
            total *= 1.01;
            count++;
        } total < k total k {
            total *= 1.01;
            count++;
        } total *= 1.01 total 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 k = sc.nextLong();
        long total = 100;
        int count = 0;
        while(total < k) {
            total *= 1.01;
            count++;
        }
        System.out.println(count);
    }
} public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long k = sc.nextLong();
        long total = 100;
        int count = 0;
        while(total < k) {
            total *= 1.01;
            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 k = sc.nextLong();
        long total = 100;
        int count = 0;
        while(total < k) {
            total *= 1.01;
            count++;
        }
        System.out.println(count);
    }
}