import java.util.Scanner;
class Main{
    public static void main(String args[]){
        Scanner scan = new Scanner(System.in);
        long a = 100;
        double num = scan.nextDouble();
        int aa = 0;
        while(a < num){
            a = a + a/100;
            aa++;      
        }
        System.out.println(aa);
    }
} import java.util.Scanner; Scanner java.util class Main{
    public static void main(String args[]){
        Scanner scan = new Scanner(System.in);
        long a = 100;
        double num = scan.nextDouble();
        int aa = 0;
        while(a < num){
            a = a + a/100;
            aa++;      
        }
        System.out.println(aa);
    }
} Main public static void main(String args[]){
        Scanner scan = new Scanner(System.in);
        long a = 100;
        double num = scan.nextDouble();
        int aa = 0;
        while(a < num){
            a = a + a/100;
            aa++;      
        }
        System.out.println(aa);
    } main {
        Scanner scan = new Scanner(System.in);
        long a = 100;
        double num = scan.nextDouble();
        int aa = 0;
        while(a < num){
            a = a + a/100;
            aa++;      
        }
        System.out.println(aa);
    } Scanner scan = new Scanner(System.in); scan new Scanner(System.in) long a = 100; a 100 double num = scan.nextDouble(); num scan.nextDouble() scan.nextDouble scan int aa = 0; aa 0 while(a < num){
            a = a + a/100;
            aa++;      
        } a < num a num {
            a = a + a/100;
            aa++;      
        } a = a + a/100 a a + a/100 a a/100 a 100 aa++ aa System.out.println(aa) System.out.println System.out System System.out aa String args[] args
import java.util.Scanner;
class Main{
    public static void main(String args[]){
        Scanner scan = new Scanner(System.in);
        long a = 100;
        double num = scan.nextDouble();
        int aa = 0;
        while(a < num){
            a = a + a/100;
            aa++;      
        }
        System.out.println(aa);
    }
}
