import java.lang.reflect.Array;
import java.text.SimpleDateFormat;
import java.util.*;

public class Main {

    private static void nCombination3(int c) {
        int count = c;
        int num = 0;
        for (int i = 0; i < count - 2; i++) {
            for (int j = i + 1; j < count - 1; j++) {
                for (int k = j + 1; k < count; k++) {
                    num++;
                }
            }
        }
    }



    public static void main(String[] args) {
        // write your code here
        Scanner sc=new Scanner(System.in);
        double X=sc.nextDouble();
        boolean flag = false;
        long temp = 100;
        for(int i=1;i<=100000;i++){
            temp *= 1.01;
            if(temp>=X){
                System.out.println(i);
                break;
            }
        }





    }
} import java.lang.reflect.Array; Array java.lang.reflect import java.text.SimpleDateFormat; SimpleDateFormat java.text import java.util.*; util.* java public class Main {

    private static void nCombination3(int c) {
        int count = c;
        int num = 0;
        for (int i = 0; i < count - 2; i++) {
            for (int j = i + 1; j < count - 1; j++) {
                for (int k = j + 1; k < count; k++) {
                    num++;
                }
            }
        }
    }



    public static void main(String[] args) {
        // write your code here
        Scanner sc=new Scanner(System.in);
        double X=sc.nextDouble();
        boolean flag = false;
        long temp = 100;
        for(int i=1;i<=100000;i++){
            temp *= 1.01;
            if(temp>=X){
                System.out.println(i);
                break;
            }
        }





    }
} Main private static void nCombination3(int c) {
        int count = c;
        int num = 0;
        for (int i = 0; i < count - 2; i++) {
            for (int j = i + 1; j < count - 1; j++) {
                for (int k = j + 1; k < count; k++) {
                    num++;
                }
            }
        }
    } nCombination3 {
        int count = c;
        int num = 0;
        for (int i = 0; i < count - 2; i++) {
            for (int j = i + 1; j < count - 1; j++) {
                for (int k = j + 1; k < count; k++) {
                    num++;
                }
            }
        }
    } int count = c; count c int num = 0; num 0 for (int i = 0; i < count - 2; i++) {
            for (int j = i + 1; j < count - 1; j++) {
                for (int k = j + 1; k < count; k++) {
                    num++;
                }
            }
        } int i = 0; int i = 0; i 0 i < count - 2 i count - 2 count 2 i++ i++ i {
            for (int j = i + 1; j < count - 1; j++) {
                for (int k = j + 1; k < count; k++) {
                    num++;
                }
            }
        } {
            for (int j = i + 1; j < count - 1; j++) {
                for (int k = j + 1; k < count; k++) {
                    num++;
                }
            }
        } for (int j = i + 1; j < count - 1; j++) {
                for (int k = j + 1; k < count; k++) {
                    num++;
                }
            } int j = i + 1; int j = i + 1; j i + 1 i 1 j < count - 1 j count - 1 count 1 j++ j++ j {
                for (int k = j + 1; k < count; k++) {
                    num++;
                }
            } {
                for (int k = j + 1; k < count; k++) {
                    num++;
                }
            } for (int k = j + 1; k < count; k++) {
                    num++;
                } int k = j + 1; int k = j + 1; k j + 1 j 1 k < count k count k++ k++ k {
                    num++;
                } {
                    num++;
                } num++ num int c c public static void main(String[] args) {
        // write your code here
        Scanner sc=new Scanner(System.in);
        double X=sc.nextDouble();
        boolean flag = false;
        long temp = 100;
        for(int i=1;i<=100000;i++){
            temp *= 1.01;
            if(temp>=X){
                System.out.println(i);
                break;
            }
        }





    } main {
        // write your code here
        Scanner sc=new Scanner(System.in);
        double X=sc.nextDouble();
        boolean flag = false;
        long temp = 100;
        for(int i=1;i<=100000;i++){
            temp *= 1.01;
            if(temp>=X){
                System.out.println(i);
                break;
            }
        }





    } Scanner sc=new Scanner(System.in); sc new Scanner(System.in) double X=sc.nextDouble(); X sc.nextDouble() sc.nextDouble sc boolean flag = false; flag false long temp = 100; temp 100 for(int i=1;i<=100000;i++){
            temp *= 1.01;
            if(temp>=X){
                System.out.println(i);
                break;
            }
        } int i=1; int i=1; i 1 i<=100000 i 100000 i++ i++ i {
            temp *= 1.01;
            if(temp>=X){
                System.out.println(i);
                break;
            }
        } {
            temp *= 1.01;
            if(temp>=X){
                System.out.println(i);
                break;
            }
        } temp *= 1.01 temp 1.01 if(temp>=X){
                System.out.println(i);
                break;
            } temp>=X temp X {
                System.out.println(i);
                break;
            } System.out.println(i) System.out.println System.out System System.out i break; String[] args args public class Main {

    private static void nCombination3(int c) {
        int count = c;
        int num = 0;
        for (int i = 0; i < count - 2; i++) {
            for (int j = i + 1; j < count - 1; j++) {
                for (int k = j + 1; k < count; k++) {
                    num++;
                }
            }
        }
    }



    public static void main(String[] args) {
        // write your code here
        Scanner sc=new Scanner(System.in);
        double X=sc.nextDouble();
        boolean flag = false;
        long temp = 100;
        for(int i=1;i<=100000;i++){
            temp *= 1.01;
            if(temp>=X){
                System.out.println(i);
                break;
            }
        }





    }
} public class Main {

    private static void nCombination3(int c) {
        int count = c;
        int num = 0;
        for (int i = 0; i < count - 2; i++) {
            for (int j = i + 1; j < count - 1; j++) {
                for (int k = j + 1; k < count; k++) {
                    num++;
                }
            }
        }
    }



    public static void main(String[] args) {
        // write your code here
        Scanner sc=new Scanner(System.in);
        double X=sc.nextDouble();
        boolean flag = false;
        long temp = 100;
        for(int i=1;i<=100000;i++){
            temp *= 1.01;
            if(temp>=X){
                System.out.println(i);
                break;
            }
        }





    }
} Main
import java.lang.reflect.Array;
import java.text.SimpleDateFormat;
import java.util.*;

public class Main {

    private static void nCombination3(int c) {
        int count = c;
        int num = 0;
        for (int i = 0; i < count - 2; i++) {
            for (int j = i + 1; j < count - 1; j++) {
                for (int k = j + 1; k < count; k++) {
                    num++;
                }
            }
        }
    }



    public static void main(String[] args) {
        // write your code here
        Scanner sc=new Scanner(System.in);
        double X=sc.nextDouble();
        boolean flag = false;
        long temp = 100;
        for(int i=1;i<=100000;i++){
            temp *= 1.01;
            if(temp>=X){
                System.out.println(i);
                break;
            }
        }





    }
}
