import java.util.*;

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

        int count = 1;
        long money = 100;
        while (true) {
            money *= 1.01;
            if (money >= X) {
                System.out.println(count);
                return;
            }
            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();

        int count = 1;
        long money = 100;
        while (true) {
            money *= 1.01;
            if (money >= X) {
                System.out.println(count);
                return;
            }
            count++;
        }
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long X = sc.nextLong();

        int count = 1;
        long money = 100;
        while (true) {
            money *= 1.01;
            if (money >= X) {
                System.out.println(count);
                return;
            }
            count++;
        }
    } main {
        Scanner sc = new Scanner(System.in);
        long X = sc.nextLong();

        int count = 1;
        long money = 100;
        while (true) {
            money *= 1.01;
            if (money >= X) {
                System.out.println(count);
                return;
            }
            count++;
        }
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) long X = sc.nextLong(); X sc.nextLong() sc.nextLong sc int count = 1; count 1 long money = 100; money 100 while (true) {
            money *= 1.01;
            if (money >= X) {
                System.out.println(count);
                return;
            }
            count++;
        } true {
            money *= 1.01;
            if (money >= X) {
                System.out.println(count);
                return;
            }
            count++;
        } money *= 1.01 money 1.01 if (money >= X) {
                System.out.println(count);
                return;
            } money >= X money X {
                System.out.println(count);
                return;
            } System.out.println(count) System.out.println System.out System System.out count return; count++ count String[] args args public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long X = sc.nextLong();

        int count = 1;
        long money = 100;
        while (true) {
            money *= 1.01;
            if (money >= X) {
                System.out.println(count);
                return;
            }
            count++;
        }
    }
} public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long X = sc.nextLong();

        int count = 1;
        long money = 100;
        while (true) {
            money *= 1.01;
            if (money >= X) {
                System.out.println(count);
                return;
            }
            count++;
        }
    }
} Main
import java.util.*;

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

        int count = 1;
        long money = 100;
        while (true) {
            money *= 1.01;
            if (money >= X) {
                System.out.println(count);
                return;
            }
            count++;
        }
    }
}