import java.util.Scanner;

class Main {
    public static void main(final String[] args) {
        Scanner sc = new Scanner(System.in);
        String x = sc.next();
        double xDouble = Double.valueOf(x);

        int ans = 0;
        double tot = 100;
        while (tot < xDouble) {
            tot = Math.floor(tot * 1.01);
            ans ++;
        }

        System.out.println(ans);    

    }
} import java.util.Scanner; Scanner java.util class Main {
    public static void main(final String[] args) {
        Scanner sc = new Scanner(System.in);
        String x = sc.next();
        double xDouble = Double.valueOf(x);

        int ans = 0;
        double tot = 100;
        while (tot < xDouble) {
            tot = Math.floor(tot * 1.01);
            ans ++;
        }

        System.out.println(ans);    

    }
} Main public static void main(final String[] args) {
        Scanner sc = new Scanner(System.in);
        String x = sc.next();
        double xDouble = Double.valueOf(x);

        int ans = 0;
        double tot = 100;
        while (tot < xDouble) {
            tot = Math.floor(tot * 1.01);
            ans ++;
        }

        System.out.println(ans);    

    } main {
        Scanner sc = new Scanner(System.in);
        String x = sc.next();
        double xDouble = Double.valueOf(x);

        int ans = 0;
        double tot = 100;
        while (tot < xDouble) {
            tot = Math.floor(tot * 1.01);
            ans ++;
        }

        System.out.println(ans);    

    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String x = sc.next(); x sc.next() sc.next sc double xDouble = Double.valueOf(x); xDouble Double.valueOf(x) Double.valueOf Double x int ans = 0; ans 0 double tot = 100; tot 100 while (tot < xDouble) {
            tot = Math.floor(tot * 1.01);
            ans ++;
        } tot < xDouble tot xDouble {
            tot = Math.floor(tot * 1.01);
            ans ++;
        } tot = Math.floor(tot * 1.01) tot Math.floor(tot * 1.01) Math.floor Math tot * 1.01 tot 1.01 ans ++ ans System.out.println(ans) System.out.println System.out System System.out ans final String[] args args
import java.util.Scanner;

class Main {
    public static void main(final String[] args) {
        Scanner sc = new Scanner(System.in);
        String x = sc.next();
        double xDouble = Double.valueOf(x);

        int ans = 0;
        double tot = 100;
        while (tot < xDouble) {
            tot = Math.floor(tot * 1.01);
            ans ++;
        }

        System.out.println(ans);    

    }
}
