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