import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		double x = sc.nextDouble();
		double money = 100;
		double answer = 0;
		while(money < x) {
			answer++;
			money = Math.floor(money * ((double)101 /(double)100));
		}

		System.out.println((int)answer);
	}
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		double x = sc.nextDouble();
		double money = 100;
		double answer = 0;
		while(money < x) {
			answer++;
			money = Math.floor(money * ((double)101 /(double)100));
		}

		System.out.println((int)answer);
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		double x = sc.nextDouble();
		double money = 100;
		double answer = 0;
		while(money < x) {
			answer++;
			money = Math.floor(money * ((double)101 /(double)100));
		}

		System.out.println((int)answer);
	} main {
		Scanner sc = new Scanner(System.in);
		double x = sc.nextDouble();
		double money = 100;
		double answer = 0;
		while(money < x) {
			answer++;
			money = Math.floor(money * ((double)101 /(double)100));
		}

		System.out.println((int)answer);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) double x = sc.nextDouble(); x sc.nextDouble() sc.nextDouble sc double money = 100; money 100 double answer = 0; answer 0 while(money < x) {
			answer++;
			money = Math.floor(money * ((double)101 /(double)100));
		} money < x money x {
			answer++;
			money = Math.floor(money * ((double)101 /(double)100));
		} answer++ answer money = Math.floor(money * ((double)101 /(double)100)) money Math.floor(money * ((double)101 /(double)100)) Math.floor Math money * ((double)101 /(double)100) money ((double)101 /(double)100) (double)101 (double)100 System.out.println((int)answer) System.out.println System.out System System.out (int)answer String[] args args public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		double x = sc.nextDouble();
		double money = 100;
		double answer = 0;
		while(money < x) {
			answer++;
			money = Math.floor(money * ((double)101 /(double)100));
		}

		System.out.println((int)answer);
	}
} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		double x = sc.nextDouble();
		double money = 100;
		double answer = 0;
		while(money < x) {
			answer++;
			money = Math.floor(money * ((double)101 /(double)100));
		}

		System.out.println((int)answer);
	}
} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		double x = sc.nextDouble();
		double money = 100;
		double answer = 0;
		while(money < x) {
			answer++;
			money = Math.floor(money * ((double)101 /(double)100));
		}

		System.out.println((int)answer);
	}
}