import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

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

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        long x = Long.parseLong(br.readLine());

        br.close();

        long now = 100;
        int ans = 0;

        while (now < x) {
            now = (long) (now * 1.01);
            ans++;
        }

        bw.write(String.valueOf(ans));

        bw.flush();

    }
} import java.io.BufferedReader; BufferedReader java.io import java.io.BufferedWriter; BufferedWriter java.io import java.io.InputStreamReader; InputStreamReader java.io import java.io.OutputStreamWriter; OutputStreamWriter java.io public class Main {
    public static void main(String[] args) throws Exception {

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        long x = Long.parseLong(br.readLine());

        br.close();

        long now = 100;
        int ans = 0;

        while (now < x) {
            now = (long) (now * 1.01);
            ans++;
        }

        bw.write(String.valueOf(ans));

        bw.flush();

    }
} Main public static void main(String[] args) throws Exception {

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        long x = Long.parseLong(br.readLine());

        br.close();

        long now = 100;
        int ans = 0;

        while (now < x) {
            now = (long) (now * 1.01);
            ans++;
        }

        bw.write(String.valueOf(ans));

        bw.flush();

    } main {

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        long x = Long.parseLong(br.readLine());

        br.close();

        long now = 100;
        int ans = 0;

        while (now < x) {
            now = (long) (now * 1.01);
            ans++;
        }

        bw.write(String.valueOf(ans));

        bw.flush();

    } BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); br new BufferedReader(new InputStreamReader(System.in)) BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out)); bw new BufferedWriter(new OutputStreamWriter(System.out)) long x = Long.parseLong(br.readLine()); x Long.parseLong(br.readLine()) Long.parseLong Long br.readLine() br.readLine br br.close() br.close br long now = 100; now 100 int ans = 0; ans 0 while (now < x) {
            now = (long) (now * 1.01);
            ans++;
        } now < x now x {
            now = (long) (now * 1.01);
            ans++;
        } now = (long) (now * 1.01) now (long) (now * 1.01) now 1.01 ans++ ans bw.write(String.valueOf(ans)) bw.write bw String.valueOf(ans) String.valueOf String ans bw.flush() bw.flush bw String[] args args public class Main {
    public static void main(String[] args) throws Exception {

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        long x = Long.parseLong(br.readLine());

        br.close();

        long now = 100;
        int ans = 0;

        while (now < x) {
            now = (long) (now * 1.01);
            ans++;
        }

        bw.write(String.valueOf(ans));

        bw.flush();

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

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        long x = Long.parseLong(br.readLine());

        br.close();

        long now = 100;
        int ans = 0;

        while (now < x) {
            now = (long) (now * 1.01);
            ans++;
        }

        bw.write(String.valueOf(ans));

        bw.flush();

    }
} Main
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

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

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        long x = Long.parseLong(br.readLine());

        br.close();

        long now = 100;
        int ans = 0;

        while (now < x) {
            now = (long) (now * 1.01);
            ans++;
        }

        bw.write(String.valueOf(ans));

        bw.flush();

    }
}