import java.util.Scanner;
public class Main{
    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        
        Long X = scanner.nextLong();
        Long i = 100L;
        int count = 0;
        while(i < X){
            i += i/100;
            count += 1;
        }

        System.out.println(count);
    }
} import java.util.Scanner; Scanner java.util public class Main{
    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        
        Long X = scanner.nextLong();
        Long i = 100L;
        int count = 0;
        while(i < X){
            i += i/100;
            count += 1;
        }

        System.out.println(count);
    }
} Main public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        
        Long X = scanner.nextLong();
        Long i = 100L;
        int count = 0;
        while(i < X){
            i += i/100;
            count += 1;
        }

        System.out.println(count);
    } main {
        Scanner scanner = new Scanner(System.in);
        
        Long X = scanner.nextLong();
        Long i = 100L;
        int count = 0;
        while(i < X){
            i += i/100;
            count += 1;
        }

        System.out.println(count);
    } Scanner scanner = new Scanner(System.in); scanner new Scanner(System.in) Long X = scanner.nextLong(); X scanner.nextLong() scanner.nextLong scanner Long i = 100L; i 100L int count = 0; count 0 while(i < X){
            i += i/100;
            count += 1;
        } i < X i X {
            i += i/100;
            count += 1;
        } i += i/100 i i/100 i 100 count += 1 count 1 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 scanner = new Scanner(System.in);
        
        Long X = scanner.nextLong();
        Long i = 100L;
        int count = 0;
        while(i < X){
            i += i/100;
            count += 1;
        }

        System.out.println(count);
    }
} public class Main{
    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        
        Long X = scanner.nextLong();
        Long i = 100L;
        int count = 0;
        while(i < X){
            i += i/100;
            count += 1;
        }

        System.out.println(count);
    }
} Main
import java.util.Scanner;
public class Main{
    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        
        Long X = scanner.nextLong();
        Long i = 100L;
        int count = 0;
        while(i < X){
            i += i/100;
            count += 1;
        }

        System.out.println(count);
    }
}