import java.util.*;

public class Main {
    public static void main(String[] args){
      Scanner scan = new Scanner(System.in);
      double str = Double.parseDouble((String)scan.next());
      int count=0;
      double total=100;
      
      while(true){
          total *= 1.01;
          total = Math.floor(total);
          count++;
          if(str <= total){
              break;
          }
      }
      
      System.out.println(count);
      scan.close();
    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args){
      Scanner scan = new Scanner(System.in);
      double str = Double.parseDouble((String)scan.next());
      int count=0;
      double total=100;
      
      while(true){
          total *= 1.01;
          total = Math.floor(total);
          count++;
          if(str <= total){
              break;
          }
      }
      
      System.out.println(count);
      scan.close();
    }
} Main public static void main(String[] args){
      Scanner scan = new Scanner(System.in);
      double str = Double.parseDouble((String)scan.next());
      int count=0;
      double total=100;
      
      while(true){
          total *= 1.01;
          total = Math.floor(total);
          count++;
          if(str <= total){
              break;
          }
      }
      
      System.out.println(count);
      scan.close();
    } main {
      Scanner scan = new Scanner(System.in);
      double str = Double.parseDouble((String)scan.next());
      int count=0;
      double total=100;
      
      while(true){
          total *= 1.01;
          total = Math.floor(total);
          count++;
          if(str <= total){
              break;
          }
      }
      
      System.out.println(count);
      scan.close();
    } Scanner scan = new Scanner(System.in); scan new Scanner(System.in) double str = Double.parseDouble((String)scan.next()); str Double.parseDouble((String)scan.next()) Double.parseDouble Double (String)scan.next() scan.next scan int count=0; count 0 double total=100; total 100 while(true){
          total *= 1.01;
          total = Math.floor(total);
          count++;
          if(str <= total){
              break;
          }
      } true {
          total *= 1.01;
          total = Math.floor(total);
          count++;
          if(str <= total){
              break;
          }
      } total *= 1.01 total 1.01 total = Math.floor(total) total Math.floor(total) Math.floor Math total count++ count if(str <= total){
              break;
          } str <= total str total {
              break;
          } break; System.out.println(count) System.out.println System.out System System.out count scan.close() scan.close scan String[] args args public class Main {
    public static void main(String[] args){
      Scanner scan = new Scanner(System.in);
      double str = Double.parseDouble((String)scan.next());
      int count=0;
      double total=100;
      
      while(true){
          total *= 1.01;
          total = Math.floor(total);
          count++;
          if(str <= total){
              break;
          }
      }
      
      System.out.println(count);
      scan.close();
    }
} public class Main {
    public static void main(String[] args){
      Scanner scan = new Scanner(System.in);
      double str = Double.parseDouble((String)scan.next());
      int count=0;
      double total=100;
      
      while(true){
          total *= 1.01;
          total = Math.floor(total);
          count++;
          if(str <= total){
              break;
          }
      }
      
      System.out.println(count);
      scan.close();
    }
} Main
import java.util.*;

public class Main {
    public static void main(String[] args){
      Scanner scan = new Scanner(System.in);
      double str = Double.parseDouble((String)scan.next());
      int count=0;
      double total=100;
      
      while(true){
          total *= 1.01;
          total = Math.floor(total);
          count++;
          if(str <= total){
              break;
          }
      }
      
      System.out.println(count);
      scan.close();
    }
}