import java.util.Scanner;

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