//package atcoder;
 
import java.util.*;
 
public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long X = sc.nextLong();
		long rishi = 100;
		long count = 0;
		//System.out.println(Math.pow(1.01, 2));
		while(rishi<X) {
			rishi = (long) Math.floor(rishi*1.01);
			count ++;
			//System.out.println(count);
		}
		System.out.println(count);
		}
		
	} import java.util.*; util.* java public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long X = sc.nextLong();
		long rishi = 100;
		long count = 0;
		//System.out.println(Math.pow(1.01, 2));
		while(rishi<X) {
			rishi = (long) Math.floor(rishi*1.01);
			count ++;
			//System.out.println(count);
		}
		System.out.println(count);
		}
		
	} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long X = sc.nextLong();
		long rishi = 100;
		long count = 0;
		//System.out.println(Math.pow(1.01, 2));
		while(rishi<X) {
			rishi = (long) Math.floor(rishi*1.01);
			count ++;
			//System.out.println(count);
		}
		System.out.println(count);
		} main {
		Scanner sc = new Scanner(System.in);
		long X = sc.nextLong();
		long rishi = 100;
		long count = 0;
		//System.out.println(Math.pow(1.01, 2));
		while(rishi<X) {
			rishi = (long) Math.floor(rishi*1.01);
			count ++;
			//System.out.println(count);
		}
		System.out.println(count);
		} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) long X = sc.nextLong(); X sc.nextLong() sc.nextLong sc long rishi = 100; rishi 100 long count = 0; count 0 while(rishi<X) {
			rishi = (long) Math.floor(rishi*1.01);
			count ++;
			//System.out.println(count);
		} rishi<X rishi X {
			rishi = (long) Math.floor(rishi*1.01);
			count ++;
			//System.out.println(count);
		} rishi = (long) Math.floor(rishi*1.01) rishi (long) Math.floor(rishi*1.01) Math.floor Math rishi*1.01 rishi 1.01 count ++ count System.out.println(count) System.out.println System.out System System.out count String[] args args public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long X = sc.nextLong();
		long rishi = 100;
		long count = 0;
		//System.out.println(Math.pow(1.01, 2));
		while(rishi<X) {
			rishi = (long) Math.floor(rishi*1.01);
			count ++;
			//System.out.println(count);
		}
		System.out.println(count);
		}
		
	} public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long X = sc.nextLong();
		long rishi = 100;
		long count = 0;
		//System.out.println(Math.pow(1.01, 2));
		while(rishi<X) {
			rishi = (long) Math.floor(rishi*1.01);
			count ++;
			//System.out.println(count);
		}
		System.out.println(count);
		}
		
	} Main
//package atcoder;
 
import java.util.*;
 
public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long X = sc.nextLong();
		long rishi = 100;
		long count = 0;
		//System.out.println(Math.pow(1.01, 2));
		while(rishi<X) {
			rishi = (long) Math.floor(rishi*1.01);
			count ++;
			//System.out.println(count);
		}
		System.out.println(count);
		}
		
	}
