
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {

		Scanner sc=new Scanner(System.in);
		long X=sc.nextLong();

		long h =100L;
		int count = 0;
		sc.close();

		while(h < X) {
			h *= 1.01;
			count++;
		}

		System.out.println(count);




	}
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {

		Scanner sc=new Scanner(System.in);
		long X=sc.nextLong();

		long h =100L;
		int count = 0;
		sc.close();

		while(h < X) {
			h *= 1.01;
			count++;
		}

		System.out.println(count);




	}
} Main public static void main(String[] args) {

		Scanner sc=new Scanner(System.in);
		long X=sc.nextLong();

		long h =100L;
		int count = 0;
		sc.close();

		while(h < X) {
			h *= 1.01;
			count++;
		}

		System.out.println(count);




	} main {

		Scanner sc=new Scanner(System.in);
		long X=sc.nextLong();

		long h =100L;
		int count = 0;
		sc.close();

		while(h < X) {
			h *= 1.01;
			count++;
		}

		System.out.println(count);




	} Scanner sc=new Scanner(System.in); sc new Scanner(System.in) long X=sc.nextLong(); X sc.nextLong() sc.nextLong sc long h =100L; h 100L int count = 0; count 0 sc.close() sc.close sc while(h < X) {
			h *= 1.01;
			count++;
		} h < X h X {
			h *= 1.01;
			count++;
		} h *= 1.01 h 1.01 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 X=sc.nextLong();

		long h =100L;
		int count = 0;
		sc.close();

		while(h < X) {
			h *= 1.01;
			count++;
		}

		System.out.println(count);




	}
} public class Main {
	public static void main(String[] args) {

		Scanner sc=new Scanner(System.in);
		long X=sc.nextLong();

		long h =100L;
		int count = 0;
		sc.close();

		while(h < X) {
			h *= 1.01;
			count++;
		}

		System.out.println(count);




	}
} Main

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {

		Scanner sc=new Scanner(System.in);
		long X=sc.nextLong();

		long h =100L;
		int count = 0;
		sc.close();

		while(h < X) {
			h *= 1.01;
			count++;
		}

		System.out.println(count);




	}
}
