import java.util.Scanner;

public class Main {
    public static void main(String[] args) {


        long havingMoney = 100;
        long pastYear = 0;
        Scanner sc = new Scanner(System.in);
        long target = Long.parseLong(sc.next());

        while(havingMoney < target){
            havingMoney = (long) (havingMoney*1.01);
            pastYear++;
        }
        System.out.println(pastYear);
    }
} import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) {


        long havingMoney = 100;
        long pastYear = 0;
        Scanner sc = new Scanner(System.in);
        long target = Long.parseLong(sc.next());

        while(havingMoney < target){
            havingMoney = (long) (havingMoney*1.01);
            pastYear++;
        }
        System.out.println(pastYear);
    }
} Main public static void main(String[] args) {


        long havingMoney = 100;
        long pastYear = 0;
        Scanner sc = new Scanner(System.in);
        long target = Long.parseLong(sc.next());

        while(havingMoney < target){
            havingMoney = (long) (havingMoney*1.01);
            pastYear++;
        }
        System.out.println(pastYear);
    } main {


        long havingMoney = 100;
        long pastYear = 0;
        Scanner sc = new Scanner(System.in);
        long target = Long.parseLong(sc.next());

        while(havingMoney < target){
            havingMoney = (long) (havingMoney*1.01);
            pastYear++;
        }
        System.out.println(pastYear);
    } long havingMoney = 100; havingMoney 100 long pastYear = 0; pastYear 0 Scanner sc = new Scanner(System.in); sc new Scanner(System.in) long target = Long.parseLong(sc.next()); target Long.parseLong(sc.next()) Long.parseLong Long sc.next() sc.next sc while(havingMoney < target){
            havingMoney = (long) (havingMoney*1.01);
            pastYear++;
        } havingMoney < target havingMoney target {
            havingMoney = (long) (havingMoney*1.01);
            pastYear++;
        } havingMoney = (long) (havingMoney*1.01) havingMoney (long) (havingMoney*1.01) havingMoney 1.01 pastYear++ pastYear System.out.println(pastYear) System.out.println System.out System System.out pastYear String[] args args public class Main {
    public static void main(String[] args) {


        long havingMoney = 100;
        long pastYear = 0;
        Scanner sc = new Scanner(System.in);
        long target = Long.parseLong(sc.next());

        while(havingMoney < target){
            havingMoney = (long) (havingMoney*1.01);
            pastYear++;
        }
        System.out.println(pastYear);
    }
} public class Main {
    public static void main(String[] args) {


        long havingMoney = 100;
        long pastYear = 0;
        Scanner sc = new Scanner(System.in);
        long target = Long.parseLong(sc.next());

        while(havingMoney < target){
            havingMoney = (long) (havingMoney*1.01);
            pastYear++;
        }
        System.out.println(pastYear);
    }
} Main
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {


        long havingMoney = 100;
        long pastYear = 0;
        Scanner sc = new Scanner(System.in);
        long target = Long.parseLong(sc.next());

        while(havingMoney < target){
            havingMoney = (long) (havingMoney*1.01);
            pastYear++;
        }
        System.out.println(pastYear);
    }
}
