import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		double yokin = 100;
		long X = scanner.nextLong();
		int i = 0;
		while(yokin < X) {
			yokin = Math.floor(yokin * 1.01);
			i++;
		}
		System.out.println(i);
	}
} import java.util.ArrayList; ArrayList java.util import java.util.List; List java.util import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		double yokin = 100;
		long X = scanner.nextLong();
		int i = 0;
		while(yokin < X) {
			yokin = Math.floor(yokin * 1.01);
			i++;
		}
		System.out.println(i);
	}
} Main public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		double yokin = 100;
		long X = scanner.nextLong();
		int i = 0;
		while(yokin < X) {
			yokin = Math.floor(yokin * 1.01);
			i++;
		}
		System.out.println(i);
	} main {
		Scanner scanner = new Scanner(System.in);
		double yokin = 100;
		long X = scanner.nextLong();
		int i = 0;
		while(yokin < X) {
			yokin = Math.floor(yokin * 1.01);
			i++;
		}
		System.out.println(i);
	} Scanner scanner = new Scanner(System.in); scanner new Scanner(System.in) double yokin = 100; yokin 100 long X = scanner.nextLong(); X scanner.nextLong() scanner.nextLong scanner int i = 0; i 0 while(yokin < X) {
			yokin = Math.floor(yokin * 1.01);
			i++;
		} yokin < X yokin X {
			yokin = Math.floor(yokin * 1.01);
			i++;
		} yokin = Math.floor(yokin * 1.01) yokin Math.floor(yokin * 1.01) Math.floor Math yokin * 1.01 yokin 1.01 i++ i 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 scanner = new Scanner(System.in);
		double yokin = 100;
		long X = scanner.nextLong();
		int i = 0;
		while(yokin < X) {
			yokin = Math.floor(yokin * 1.01);
			i++;
		}
		System.out.println(i);
	}
} public class Main {

	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		double yokin = 100;
		long X = scanner.nextLong();
		int i = 0;
		while(yokin < X) {
			yokin = Math.floor(yokin * 1.01);
			i++;
		}
		System.out.println(i);
	}
} Main
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		double yokin = 100;
		long X = scanner.nextLong();
		int i = 0;
		while(yokin < X) {
			yokin = Math.floor(yokin * 1.01);
			i++;
		}
		System.out.println(i);
	}
}
