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