import java.util.*;
public class Main  {
   public static void main(String[] args)  {
      Scanner sc = new Scanner(System.in);
      
      long x = sc.nextLong();
      
      long a = 100;
      long count = 0;
      
      while (a < x) {
         a = a + a * 1 / 100;
         count++;
      }
      
      System.out.println(count);
   }
} import java.util.*; util.* java public class Main  {
   public static void main(String[] args)  {
      Scanner sc = new Scanner(System.in);
      
      long x = sc.nextLong();
      
      long a = 100;
      long count = 0;
      
      while (a < x) {
         a = a + a * 1 / 100;
         count++;
      }
      
      System.out.println(count);
   }
} Main public static void main(String[] args)  {
      Scanner sc = new Scanner(System.in);
      
      long x = sc.nextLong();
      
      long a = 100;
      long count = 0;
      
      while (a < x) {
         a = a + a * 1 / 100;
         count++;
      }
      
      System.out.println(count);
   } main {
      Scanner sc = new Scanner(System.in);
      
      long x = sc.nextLong();
      
      long a = 100;
      long count = 0;
      
      while (a < x) {
         a = a + a * 1 / 100;
         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 long a = 100; a 100 long count = 0; count 0 while (a < x) {
         a = a + a * 1 / 100;
         count++;
      } a < x a x {
         a = a + a * 1 / 100;
         count++;
      } a = a + a * 1 / 100 a a + a * 1 / 100 a a * 1 / 100 a * 1 a 1 100 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();
      
      long a = 100;
      long count = 0;
      
      while (a < x) {
         a = a + a * 1 / 100;
         count++;
      }
      
      System.out.println(count);
   }
} public class Main  {
   public static void main(String[] args)  {
      Scanner sc = new Scanner(System.in);
      
      long x = sc.nextLong();
      
      long a = 100;
      long count = 0;
      
      while (a < x) {
         a = a + a * 1 / 100;
         count++;
      }
      
      System.out.println(count);
   }
} Main
import java.util.*;
public class Main  {
   public static void main(String[] args)  {
      Scanner sc = new Scanner(System.in);
      
      long x = sc.nextLong();
      
      long a = 100;
      long count = 0;
      
      while (a < x) {
         a = a + a * 1 / 100;
         count++;
      }
      
      System.out.println(count);
   }
}