import java.util.Scanner;
 
public class Main {
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    
    long X=sc.nextLong();
    int count=0;
    int N=100;
    double money=N;
    while (money<X) {
    	money=money*1.01;
    	money=Math.floor(money);
    	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 X=sc.nextLong();
    int count=0;
    int N=100;
    double money=N;
    while (money<X) {
    	money=money*1.01;
    	money=Math.floor(money);
    	count++;
    }
    System.out.println(count);
    }} Main public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    
    long X=sc.nextLong();
    int count=0;
    int N=100;
    double money=N;
    while (money<X) {
    	money=money*1.01;
    	money=Math.floor(money);
    	count++;
    }
    System.out.println(count);
    } main {
    Scanner sc = new Scanner(System.in);
    
    long X=sc.nextLong();
    int count=0;
    int N=100;
    double money=N;
    while (money<X) {
    	money=money*1.01;
    	money=Math.floor(money);
    	count++;
    }
    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 int count=0; count 0 int N=100; N 100 double money=N; money N while (money<X) {
    	money=money*1.01;
    	money=Math.floor(money);
    	count++;
    } money<X money X {
    	money=money*1.01;
    	money=Math.floor(money);
    	count++;
    } money=money*1.01 money money*1.01 money 1.01 money=Math.floor(money) money Math.floor(money) Math.floor Math money 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 X=sc.nextLong();
    int count=0;
    int N=100;
    double money=N;
    while (money<X) {
    	money=money*1.01;
    	money=Math.floor(money);
    	count++;
    }
    System.out.println(count);
    }} public class Main {
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    
    long X=sc.nextLong();
    int count=0;
    int N=100;
    double money=N;
    while (money<X) {
    	money=money*1.01;
    	money=Math.floor(money);
    	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 X=sc.nextLong();
    int count=0;
    int N=100;
    double money=N;
    while (money<X) {
    	money=money*1.01;
    	money=Math.floor(money);
    	count++;
    }
    System.out.println(count);
    }}