import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		int year;
		long money;
		double X;
		Scanner sc = new Scanner(System.in);
		
		X = Double.parseDouble(sc.next());
		sc.close();
		
		money = 100;
		for(year = 0;money < X;year++,money *= 1.01);
		
		System.out.println(year);
	}
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		int year;
		long money;
		double X;
		Scanner sc = new Scanner(System.in);
		
		X = Double.parseDouble(sc.next());
		sc.close();
		
		money = 100;
		for(year = 0;money < X;year++,money *= 1.01);
		
		System.out.println(year);
	}
} Main public static void main(String[] args) {
		int year;
		long money;
		double X;
		Scanner sc = new Scanner(System.in);
		
		X = Double.parseDouble(sc.next());
		sc.close();
		
		money = 100;
		for(year = 0;money < X;year++,money *= 1.01);
		
		System.out.println(year);
	} main {
		int year;
		long money;
		double X;
		Scanner sc = new Scanner(System.in);
		
		X = Double.parseDouble(sc.next());
		sc.close();
		
		money = 100;
		for(year = 0;money < X;year++,money *= 1.01);
		
		System.out.println(year);
	} int year; year long money; money double X; X Scanner sc = new Scanner(System.in); sc new Scanner(System.in) X = Double.parseDouble(sc.next()) X Double.parseDouble(sc.next()) Double.parseDouble Double sc.next() sc.next sc sc.close() sc.close sc money = 100 money 100 for(year = 0;money < X;year++,money *= 1.01); year = 0; year = 0 year 0 money < X money X year++,money *= 1.01 year++ year money *= 1.01 money 1.01 ; System.out.println(year) System.out.println System.out System System.out year String[] args args public class Main {
	public static void main(String[] args) {
		int year;
		long money;
		double X;
		Scanner sc = new Scanner(System.in);
		
		X = Double.parseDouble(sc.next());
		sc.close();
		
		money = 100;
		for(year = 0;money < X;year++,money *= 1.01);
		
		System.out.println(year);
	}
} public class Main {
	public static void main(String[] args) {
		int year;
		long money;
		double X;
		Scanner sc = new Scanner(System.in);
		
		X = Double.parseDouble(sc.next());
		sc.close();
		
		money = 100;
		for(year = 0;money < X;year++,money *= 1.01);
		
		System.out.println(year);
	}
} Main
import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		int year;
		long money;
		double X;
		Scanner sc = new Scanner(System.in);
		
		X = Double.parseDouble(sc.next());
		sc.close();
		
		money = 100;
		for(year = 0;money < X;year++,money *= 1.01);
		
		System.out.println(year);
	}
}
