import java.util.Scanner;
public class Main {

    public static void main(String[] args) {
        Scanner scan=new Scanner(System.in);
long K= scan.nextLong();
long N=100;
int i=0;
while(N<K){

     N= (long) (N*1.01);
    i=i+1;



}

System.out.println(i);

        // write your code here
    }
} import java.util.Scanner; Scanner java.util public class Main {

    public static void main(String[] args) {
        Scanner scan=new Scanner(System.in);
long K= scan.nextLong();
long N=100;
int i=0;
while(N<K){

     N= (long) (N*1.01);
    i=i+1;



}

System.out.println(i);

        // write your code here
    }
} Main public static void main(String[] args) {
        Scanner scan=new Scanner(System.in);
long K= scan.nextLong();
long N=100;
int i=0;
while(N<K){

     N= (long) (N*1.01);
    i=i+1;



}

System.out.println(i);

        // write your code here
    } main {
        Scanner scan=new Scanner(System.in);
long K= scan.nextLong();
long N=100;
int i=0;
while(N<K){

     N= (long) (N*1.01);
    i=i+1;



}

System.out.println(i);

        // write your code here
    } Scanner scan=new Scanner(System.in); scan new Scanner(System.in) long K= scan.nextLong(); K scan.nextLong() scan.nextLong scan long N=100; N 100 int i=0; i 0 while(N<K){

     N= (long) (N*1.01);
    i=i+1;



} N<K N K {

     N= (long) (N*1.01);
    i=i+1;



} N= (long) (N*1.01) N (long) (N*1.01) N 1.01 i=i+1 i i+1 i 1 System.out.println(i) System.out.println System.out System System.out i String[] args args public class Main {

    public static void main(String[] args) {
        Scanner scan=new Scanner(System.in);
long K= scan.nextLong();
long N=100;
int i=0;
while(N<K){

     N= (long) (N*1.01);
    i=i+1;



}

System.out.println(i);

        // write your code here
    }
} public class Main {

    public static void main(String[] args) {
        Scanner scan=new Scanner(System.in);
long K= scan.nextLong();
long N=100;
int i=0;
while(N<K){

     N= (long) (N*1.01);
    i=i+1;



}

System.out.println(i);

        // write your code here
    }
} Main
import java.util.Scanner;
public class Main {

    public static void main(String[] args) {
        Scanner scan=new Scanner(System.in);
long K= scan.nextLong();
long N=100;
int i=0;
while(N<K){

     N= (long) (N*1.01);
    i=i+1;



}

System.out.println(i);

        // write your code here
    }
}
