import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        try (Scanner s = new Scanner(System.in)) {
            long x = s.nextLong();
            long c = 100;
            int count = 0;
            while (c < x) {
                c += c / 100;
                count++;
            }
            System.out.println(count);
        }
    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) throws Exception {
        try (Scanner s = new Scanner(System.in)) {
            long x = s.nextLong();
            long c = 100;
            int count = 0;
            while (c < x) {
                c += c / 100;
                count++;
            }
            System.out.println(count);
        }
    }
} Main public static void main(String[] args) throws Exception {
        try (Scanner s = new Scanner(System.in)) {
            long x = s.nextLong();
            long c = 100;
            int count = 0;
            while (c < x) {
                c += c / 100;
                count++;
            }
            System.out.println(count);
        }
    } main {
        try (Scanner s = new Scanner(System.in)) {
            long x = s.nextLong();
            long c = 100;
            int count = 0;
            while (c < x) {
                c += c / 100;
                count++;
            }
            System.out.println(count);
        }
    } try (Scanner s = new Scanner(System.in)) {
            long x = s.nextLong();
            long c = 100;
            int count = 0;
            while (c < x) {
                c += c / 100;
                count++;
            }
            System.out.println(count);
        } {
            long x = s.nextLong();
            long c = 100;
            int count = 0;
            while (c < x) {
                c += c / 100;
                count++;
            }
            System.out.println(count);
        } Scanner s = new Scanner(System.in) Scanner s = new Scanner(System.in) new Scanner(System.in) long x = s.nextLong(); x s.nextLong() s.nextLong s long c = 100; c 100 int count = 0; count 0 while (c < x) {
                c += c / 100;
                count++;
            } c < x c x {
                c += c / 100;
                count++;
            } c += c / 100 c c / 100 c 100 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) throws Exception {
        try (Scanner s = new Scanner(System.in)) {
            long x = s.nextLong();
            long c = 100;
            int count = 0;
            while (c < x) {
                c += c / 100;
                count++;
            }
            System.out.println(count);
        }
    }
} public class Main {
    public static void main(String[] args) throws Exception {
        try (Scanner s = new Scanner(System.in)) {
            long x = s.nextLong();
            long c = 100;
            int count = 0;
            while (c < x) {
                c += c / 100;
                count++;
            }
            System.out.println(count);
        }
    }
} Main
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        try (Scanner s = new Scanner(System.in)) {
            long x = s.nextLong();
            long c = 100;
            int count = 0;
            while (c < x) {
                c += c / 100;
                count++;
            }
            System.out.println(count);
        }
    }
}