import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		BigDecimal N =new BigDecimal(sc.nextLine());
		BigDecimal money =new BigDecimal(100);
		BigDecimal r = new BigDecimal("100");
		int con = 0;
		while (money.compareTo(N) < 0) {
			money =money.add(money.divide(r, RoundingMode.FLOOR));
			con++;
		}

		System.out.println(con);

	}
} import java.math.BigDecimal; BigDecimal java.math import java.math.RoundingMode; RoundingMode java.math import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		BigDecimal N =new BigDecimal(sc.nextLine());
		BigDecimal money =new BigDecimal(100);
		BigDecimal r = new BigDecimal("100");
		int con = 0;
		while (money.compareTo(N) < 0) {
			money =money.add(money.divide(r, RoundingMode.FLOOR));
			con++;
		}

		System.out.println(con);

	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		BigDecimal N =new BigDecimal(sc.nextLine());
		BigDecimal money =new BigDecimal(100);
		BigDecimal r = new BigDecimal("100");
		int con = 0;
		while (money.compareTo(N) < 0) {
			money =money.add(money.divide(r, RoundingMode.FLOOR));
			con++;
		}

		System.out.println(con);

	} main {
		Scanner sc = new Scanner(System.in);

		BigDecimal N =new BigDecimal(sc.nextLine());
		BigDecimal money =new BigDecimal(100);
		BigDecimal r = new BigDecimal("100");
		int con = 0;
		while (money.compareTo(N) < 0) {
			money =money.add(money.divide(r, RoundingMode.FLOOR));
			con++;
		}

		System.out.println(con);

	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) BigDecimal N =new BigDecimal(sc.nextLine()); N new BigDecimal(sc.nextLine()) BigDecimal money =new BigDecimal(100); money new BigDecimal(100) BigDecimal r = new BigDecimal("100"); r new BigDecimal("100") int con = 0; con 0 while (money.compareTo(N) < 0) {
			money =money.add(money.divide(r, RoundingMode.FLOOR));
			con++;
		} money.compareTo(N) < 0 money.compareTo(N) money.compareTo money N 0 {
			money =money.add(money.divide(r, RoundingMode.FLOOR));
			con++;
		} money =money.add(money.divide(r, RoundingMode.FLOOR)) money money.add(money.divide(r, RoundingMode.FLOOR)) money.add money money.divide(r, RoundingMode.FLOOR) money.divide money r RoundingMode.FLOOR RoundingMode RoundingMode.FLOOR con++ con System.out.println(con) System.out.println System.out System System.out con String[] args args public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		BigDecimal N =new BigDecimal(sc.nextLine());
		BigDecimal money =new BigDecimal(100);
		BigDecimal r = new BigDecimal("100");
		int con = 0;
		while (money.compareTo(N) < 0) {
			money =money.add(money.divide(r, RoundingMode.FLOOR));
			con++;
		}

		System.out.println(con);

	}
} public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		BigDecimal N =new BigDecimal(sc.nextLine());
		BigDecimal money =new BigDecimal(100);
		BigDecimal r = new BigDecimal("100");
		int con = 0;
		while (money.compareTo(N) < 0) {
			money =money.add(money.divide(r, RoundingMode.FLOOR));
			con++;
		}

		System.out.println(con);

	}
} Main
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		BigDecimal N =new BigDecimal(sc.nextLine());
		BigDecimal money =new BigDecimal(100);
		BigDecimal r = new BigDecimal("100");
		int con = 0;
		while (money.compareTo(N) < 0) {
			money =money.add(money.divide(r, RoundingMode.FLOOR));
			con++;
		}

		System.out.println(con);

	}
}