
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		double S = scan.nextDouble();
		double a = 100;
		int c = 1;
		while(true) {
			a=Math.floor(a*1.01);
			if(S<=a) {
				break;
			}
			c++;
		}
		System.out.println(c);
	}
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		double S = scan.nextDouble();
		double a = 100;
		int c = 1;
		while(true) {
			a=Math.floor(a*1.01);
			if(S<=a) {
				break;
			}
			c++;
		}
		System.out.println(c);
	}
} Main public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		double S = scan.nextDouble();
		double a = 100;
		int c = 1;
		while(true) {
			a=Math.floor(a*1.01);
			if(S<=a) {
				break;
			}
			c++;
		}
		System.out.println(c);
	} main {
		Scanner scan = new Scanner(System.in);
		double S = scan.nextDouble();
		double a = 100;
		int c = 1;
		while(true) {
			a=Math.floor(a*1.01);
			if(S<=a) {
				break;
			}
			c++;
		}
		System.out.println(c);
	} Scanner scan = new Scanner(System.in); scan new Scanner(System.in) double S = scan.nextDouble(); S scan.nextDouble() scan.nextDouble scan double a = 100; a 100 int c = 1; c 1 while(true) {
			a=Math.floor(a*1.01);
			if(S<=a) {
				break;
			}
			c++;
		} true {
			a=Math.floor(a*1.01);
			if(S<=a) {
				break;
			}
			c++;
		} a=Math.floor(a*1.01) a Math.floor(a*1.01) Math.floor Math a*1.01 a 1.01 if(S<=a) {
				break;
			} S<=a S a {
				break;
			} break; c++ c System.out.println(c) System.out.println System.out System System.out c String[] args args public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		double S = scan.nextDouble();
		double a = 100;
		int c = 1;
		while(true) {
			a=Math.floor(a*1.01);
			if(S<=a) {
				break;
			}
			c++;
		}
		System.out.println(c);
	}
} public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		double S = scan.nextDouble();
		double a = 100;
		int c = 1;
		while(true) {
			a=Math.floor(a*1.01);
			if(S<=a) {
				break;
			}
			c++;
		}
		System.out.println(c);
	}
} Main

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		double S = scan.nextDouble();
		double a = 100;
		int c = 1;
		while(true) {
			a=Math.floor(a*1.01);
			if(S<=a) {
				break;
			}
			c++;
		}
		System.out.println(c);
	}
}
