import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		long sum = 100;
		double rate = 1.01;
		long x;
		Scanner scan = new Scanner(System.in);

		x = scan.nextLong();

		int i = 0;
		while(sum < x) {
			i++;
			sum *= rate;
		}

		System.out.println(i);
	}
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		long sum = 100;
		double rate = 1.01;
		long x;
		Scanner scan = new Scanner(System.in);

		x = scan.nextLong();

		int i = 0;
		while(sum < x) {
			i++;
			sum *= rate;
		}

		System.out.println(i);
	}
} Main public static void main(String[] args) {
		long sum = 100;
		double rate = 1.01;
		long x;
		Scanner scan = new Scanner(System.in);

		x = scan.nextLong();

		int i = 0;
		while(sum < x) {
			i++;
			sum *= rate;
		}

		System.out.println(i);
	} main {
		long sum = 100;
		double rate = 1.01;
		long x;
		Scanner scan = new Scanner(System.in);

		x = scan.nextLong();

		int i = 0;
		while(sum < x) {
			i++;
			sum *= rate;
		}

		System.out.println(i);
	} long sum = 100; sum 100 double rate = 1.01; rate 1.01 long x; x Scanner scan = new Scanner(System.in); scan new Scanner(System.in) x = scan.nextLong() x scan.nextLong() scan.nextLong scan int i = 0; i 0 while(sum < x) {
			i++;
			sum *= rate;
		} sum < x sum x {
			i++;
			sum *= rate;
		} i++ i sum *= rate sum rate 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) {
		long sum = 100;
		double rate = 1.01;
		long x;
		Scanner scan = new Scanner(System.in);

		x = scan.nextLong();

		int i = 0;
		while(sum < x) {
			i++;
			sum *= rate;
		}

		System.out.println(i);
	}
} public class Main {
	public static void main(String[] args) {
		long sum = 100;
		double rate = 1.01;
		long x;
		Scanner scan = new Scanner(System.in);

		x = scan.nextLong();

		int i = 0;
		while(sum < x) {
			i++;
			sum *= rate;
		}

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

public class Main {
	public static void main(String[] args) {
		long sum = 100;
		double rate = 1.01;
		long x;
		Scanner scan = new Scanner(System.in);

		x = scan.nextLong();

		int i = 0;
		while(sum < x) {
			i++;
			sum *= rate;
		}

		System.out.println(i);
	}
}
