
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long x = sc.nextLong();
		long money = 100;
		long cnt = 0;
		while(money < x) {
			cnt++;
			money *= 1.01;
		}
		System.out.println(cnt);

	}

} 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 money = 100;
		long cnt = 0;
		while(money < x) {
			cnt++;
			money *= 1.01;
		}
		System.out.println(cnt);

	}

} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long x = sc.nextLong();
		long money = 100;
		long cnt = 0;
		while(money < x) {
			cnt++;
			money *= 1.01;
		}
		System.out.println(cnt);

	} main {
		Scanner sc = new Scanner(System.in);
		long x = sc.nextLong();
		long money = 100;
		long cnt = 0;
		while(money < x) {
			cnt++;
			money *= 1.01;
		}
		System.out.println(cnt);

	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) long x = sc.nextLong(); x sc.nextLong() sc.nextLong sc long money = 100; money 100 long cnt = 0; cnt 0 while(money < x) {
			cnt++;
			money *= 1.01;
		} money < x money x {
			cnt++;
			money *= 1.01;
		} cnt++ cnt money *= 1.01 money 1.01 System.out.println(cnt) System.out.println System.out System System.out cnt String[] args args public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long x = sc.nextLong();
		long money = 100;
		long cnt = 0;
		while(money < x) {
			cnt++;
			money *= 1.01;
		}
		System.out.println(cnt);

	}

} public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long x = sc.nextLong();
		long money = 100;
		long cnt = 0;
		while(money < x) {
			cnt++;
			money *= 1.01;
		}
		System.out.println(cnt);

	}

} 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 money = 100;
		long cnt = 0;
		while(money < x) {
			cnt++;
			money *= 1.01;
		}
		System.out.println(cnt);

	}

}
