import java.util.Scanner;

public class Main {
    public static void main(final String args[]) {
        Scanner scan = new Scanner(System.in);
        double X = scan.nextDouble();
        double K = 100;
        int i = 0;
        while(X > K){
            K = Math.floor(K * 1.01);
            i++;
        }
        System.out.println(i);

    }
} import java.util.Scanner; Scanner java.util public class Main {
    public static void main(final String args[]) {
        Scanner scan = new Scanner(System.in);
        double X = scan.nextDouble();
        double K = 100;
        int i = 0;
        while(X > K){
            K = Math.floor(K * 1.01);
            i++;
        }
        System.out.println(i);

    }
} Main public static void main(final String args[]) {
        Scanner scan = new Scanner(System.in);
        double X = scan.nextDouble();
        double K = 100;
        int i = 0;
        while(X > K){
            K = Math.floor(K * 1.01);
            i++;
        }
        System.out.println(i);

    } main {
        Scanner scan = new Scanner(System.in);
        double X = scan.nextDouble();
        double K = 100;
        int i = 0;
        while(X > K){
            K = Math.floor(K * 1.01);
            i++;
        }
        System.out.println(i);

    } Scanner scan = new Scanner(System.in); scan new Scanner(System.in) double X = scan.nextDouble(); X scan.nextDouble() scan.nextDouble scan double K = 100; K 100 int i = 0; i 0 while(X > K){
            K = Math.floor(K * 1.01);
            i++;
        } X > K X K {
            K = Math.floor(K * 1.01);
            i++;
        } K = Math.floor(K * 1.01) K Math.floor(K * 1.01) Math.floor Math K * 1.01 K 1.01 i++ i System.out.println(i) System.out.println System.out System System.out i final String args[] args public class Main {
    public static void main(final String args[]) {
        Scanner scan = new Scanner(System.in);
        double X = scan.nextDouble();
        double K = 100;
        int i = 0;
        while(X > K){
            K = Math.floor(K * 1.01);
            i++;
        }
        System.out.println(i);

    }
} public class Main {
    public static void main(final String args[]) {
        Scanner scan = new Scanner(System.in);
        double X = scan.nextDouble();
        double K = 100;
        int i = 0;
        while(X > K){
            K = Math.floor(K * 1.01);
            i++;
        }
        System.out.println(i);

    }
} Main
import java.util.Scanner;

public class Main {
    public static void main(final String args[]) {
        Scanner scan = new Scanner(System.in);
        double X = scan.nextDouble();
        double K = 100;
        int i = 0;
        while(X > K){
            K = Math.floor(K * 1.01);
            i++;
        }
        System.out.println(i);

    }
}
