import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.util.*;

public class Main {
  public static void main(String[] args) throws IOException {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    long X = Long.parseLong(in.readLine());
    long deposit = 100;
    for (long i = 1; ; i++){
      deposit = (long)(deposit * 1.01);
      if(deposit >= X ){
        System.out.println(i);
        break;
      }
    }
  }
} import java.io.BufferedReader; BufferedReader java.io import java.io.InputStreamReader; InputStreamReader java.io import java.io.IOException; IOException java.io import java.util.*; util.* java public class Main {
  public static void main(String[] args) throws IOException {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    long X = Long.parseLong(in.readLine());
    long deposit = 100;
    for (long i = 1; ; i++){
      deposit = (long)(deposit * 1.01);
      if(deposit >= X ){
        System.out.println(i);
        break;
      }
    }
  }
} Main public static void main(String[] args) throws IOException {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    long X = Long.parseLong(in.readLine());
    long deposit = 100;
    for (long i = 1; ; i++){
      deposit = (long)(deposit * 1.01);
      if(deposit >= X ){
        System.out.println(i);
        break;
      }
    }
  } main {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    long X = Long.parseLong(in.readLine());
    long deposit = 100;
    for (long i = 1; ; i++){
      deposit = (long)(deposit * 1.01);
      if(deposit >= X ){
        System.out.println(i);
        break;
      }
    }
  } BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); in new BufferedReader(new InputStreamReader(System.in)) long X = Long.parseLong(in.readLine()); X Long.parseLong(in.readLine()) Long.parseLong Long in.readLine() in.readLine in long deposit = 100; deposit 100 for (long i = 1; ; i++){
      deposit = (long)(deposit * 1.01);
      if(deposit >= X ){
        System.out.println(i);
        break;
      }
    } long i = 1; long i = 1; i 1 i++ i++ i {
      deposit = (long)(deposit * 1.01);
      if(deposit >= X ){
        System.out.println(i);
        break;
      }
    } {
      deposit = (long)(deposit * 1.01);
      if(deposit >= X ){
        System.out.println(i);
        break;
      }
    } deposit = (long)(deposit * 1.01) deposit (long)(deposit * 1.01) deposit 1.01 if(deposit >= X ){
        System.out.println(i);
        break;
      } deposit >= X deposit X {
        System.out.println(i);
        break;
      } System.out.println(i) System.out.println System.out System System.out i break; String[] args args public class Main {
  public static void main(String[] args) throws IOException {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    long X = Long.parseLong(in.readLine());
    long deposit = 100;
    for (long i = 1; ; i++){
      deposit = (long)(deposit * 1.01);
      if(deposit >= X ){
        System.out.println(i);
        break;
      }
    }
  }
} public class Main {
  public static void main(String[] args) throws IOException {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    long X = Long.parseLong(in.readLine());
    long deposit = 100;
    for (long i = 1; ; i++){
      deposit = (long)(deposit * 1.01);
      if(deposit >= X ){
        System.out.println(i);
        break;
      }
    }
  }
} Main
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.util.*;

public class Main {
  public static void main(String[] args) throws IOException {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    long X = Long.parseLong(in.readLine());
    long deposit = 100;
    for (long i = 1; ; i++){
      deposit = (long)(deposit * 1.01);
      if(deposit >= X ){
        System.out.println(i);
        break;
      }
    }
  }
}