import java.util.Scanner;

class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    long x = sc.nextLong();
    long y = 100;
    int n = 0;
    while(x>y) {
    	y *=1.01;
    	n++;
    }
    System.out.println(n);
  }
} import java.util.Scanner; Scanner java.util class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    long x = sc.nextLong();
    long y = 100;
    int n = 0;
    while(x>y) {
    	y *=1.01;
    	n++;
    }
    System.out.println(n);
  }
} Main public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    long x = sc.nextLong();
    long y = 100;
    int n = 0;
    while(x>y) {
    	y *=1.01;
    	n++;
    }
    System.out.println(n);
  } main {
    Scanner sc = new Scanner(System.in);
    long x = sc.nextLong();
    long y = 100;
    int n = 0;
    while(x>y) {
    	y *=1.01;
    	n++;
    }
    System.out.println(n);
  } 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 n = 0; n 0 while(x>y) {
    	y *=1.01;
    	n++;
    } x>y x y {
    	y *=1.01;
    	n++;
    } y *=1.01 y 1.01 n++ n System.out.println(n) System.out.println System.out System System.out n String[] args args
import java.util.Scanner;

class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    long x = sc.nextLong();
    long y = 100;
    int n = 0;
    while(x>y) {
    	y *=1.01;
    	n++;
    }
    System.out.println(n);
  }
}