import java.util.ArrayList;
import java.util.Scanner;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        long X = sc.nextLong();

        long prop = 100;
        int count = 0;
        double rate = 1.01;

        while(true){
            if(prop<X){
                prop *= rate; count++;
            } else { 
                break;
            }
        }

        System.out.println(count);

        sc.close();
    }
} import java.util.ArrayList; ArrayList java.util import java.util.Scanner; Scanner java.util public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        long X = sc.nextLong();

        long prop = 100;
        int count = 0;
        double rate = 1.01;

        while(true){
            if(prop<X){
                prop *= rate; count++;
            } else { 
                break;
            }
        }

        System.out.println(count);

        sc.close();
    }
} Main public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        long X = sc.nextLong();

        long prop = 100;
        int count = 0;
        double rate = 1.01;

        while(true){
            if(prop<X){
                prop *= rate; count++;
            } else { 
                break;
            }
        }

        System.out.println(count);

        sc.close();
    } main {
        Scanner sc = new Scanner(System.in);
        long X = sc.nextLong();

        long prop = 100;
        int count = 0;
        double rate = 1.01;

        while(true){
            if(prop<X){
                prop *= rate; count++;
            } else { 
                break;
            }
        }

        System.out.println(count);

        sc.close();
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) long X = sc.nextLong(); X sc.nextLong() sc.nextLong sc long prop = 100; prop 100 int count = 0; count 0 double rate = 1.01; rate 1.01 while(true){
            if(prop<X){
                prop *= rate; count++;
            } else { 
                break;
            }
        } true {
            if(prop<X){
                prop *= rate; count++;
            } else { 
                break;
            }
        } if(prop<X){
                prop *= rate; count++;
            } else { 
                break;
            } prop<X prop X {
                prop *= rate; count++;
            } prop *= rate prop rate count++ count { 
                break;
            } break; System.out.println(count) System.out.println System.out System System.out count sc.close() sc.close sc String[] args args public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        long X = sc.nextLong();

        long prop = 100;
        int count = 0;
        double rate = 1.01;

        while(true){
            if(prop<X){
                prop *= rate; count++;
            } else { 
                break;
            }
        }

        System.out.println(count);

        sc.close();
    }
} public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        long X = sc.nextLong();

        long prop = 100;
        int count = 0;
        double rate = 1.01;

        while(true){
            if(prop<X){
                prop *= rate; count++;
            } else { 
                break;
            }
        }

        System.out.println(count);

        sc.close();
    }
} Main
import java.util.ArrayList;
import java.util.Scanner;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        long X = sc.nextLong();

        long prop = 100;
        int count = 0;
        double rate = 1.01;

        while(true){
            if(prop<X){
                prop *= rate; count++;
            } else { 
                break;
            }
        }

        System.out.println(count);

        sc.close();
    }
}