import java.util.*;

public class Main {
    public static void main(String[] args) {
        long count =0;
        long kazu=0;
        long number=100;
        Scanner scan = new Scanner(System.in);
        String a = scan.next();
        long n=Long.parseLong(a);
        while (true){
          number=(long)(1.01*number);
          //System.out.println(number);
          count++;
          if(number>=n){
              break;
          }
        }
        System.out.println(count);
    }
}
 import java.util.*; util.* java public class Main {
    public static void main(String[] args) {
        long count =0;
        long kazu=0;
        long number=100;
        Scanner scan = new Scanner(System.in);
        String a = scan.next();
        long n=Long.parseLong(a);
        while (true){
          number=(long)(1.01*number);
          //System.out.println(number);
          count++;
          if(number>=n){
              break;
          }
        }
        System.out.println(count);
    }
} Main public static void main(String[] args) {
        long count =0;
        long kazu=0;
        long number=100;
        Scanner scan = new Scanner(System.in);
        String a = scan.next();
        long n=Long.parseLong(a);
        while (true){
          number=(long)(1.01*number);
          //System.out.println(number);
          count++;
          if(number>=n){
              break;
          }
        }
        System.out.println(count);
    } main {
        long count =0;
        long kazu=0;
        long number=100;
        Scanner scan = new Scanner(System.in);
        String a = scan.next();
        long n=Long.parseLong(a);
        while (true){
          number=(long)(1.01*number);
          //System.out.println(number);
          count++;
          if(number>=n){
              break;
          }
        }
        System.out.println(count);
    } long count =0; count 0 long kazu=0; kazu 0 long number=100; number 100 Scanner scan = new Scanner(System.in); scan new Scanner(System.in) String a = scan.next(); a scan.next() scan.next scan long n=Long.parseLong(a); n Long.parseLong(a) Long.parseLong Long a while (true){
          number=(long)(1.01*number);
          //System.out.println(number);
          count++;
          if(number>=n){
              break;
          }
        } true {
          number=(long)(1.01*number);
          //System.out.println(number);
          count++;
          if(number>=n){
              break;
          }
        } number=(long)(1.01*number) number (long)(1.01*number) 1.01 number count++ count if(number>=n){
              break;
          } number>=n number n {
              break;
          } break; 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) {
        long count =0;
        long kazu=0;
        long number=100;
        Scanner scan = new Scanner(System.in);
        String a = scan.next();
        long n=Long.parseLong(a);
        while (true){
          number=(long)(1.01*number);
          //System.out.println(number);
          count++;
          if(number>=n){
              break;
          }
        }
        System.out.println(count);
    }
} public class Main {
    public static void main(String[] args) {
        long count =0;
        long kazu=0;
        long number=100;
        Scanner scan = new Scanner(System.in);
        String a = scan.next();
        long n=Long.parseLong(a);
        while (true){
          number=(long)(1.01*number);
          //System.out.println(number);
          count++;
          if(number>=n){
              break;
          }
        }
        System.out.println(count);
    }
} Main
import java.util.*;

public class Main {
    public static void main(String[] args) {
        long count =0;
        long kazu=0;
        long number=100;
        Scanner scan = new Scanner(System.in);
        String a = scan.next();
        long n=Long.parseLong(a);
        while (true){
          number=(long)(1.01*number);
          //System.out.println(number);
          count++;
          if(number>=n){
              break;
          }
        }
        System.out.println(count);
    }
}

