
import java.io.InputStream;
import java.io.PrintStream;
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        solve(System.in, System.out);
    }

    static void solve(InputStream is, PrintStream os) {
        // Your code here!
        Scanner scan = new Scanner(is);
        long X = scan.nextLong();

        long depo = 100;
        int ans = 0;

        while(X > depo) {
            depo *= 1.01;
            ans++;
        }

        os.println(ans);
    }

} import java.io.InputStream; InputStream java.io import java.io.PrintStream; PrintStream java.io import java.util.*; util.* java public class Main {
    public static void main(String[] args) throws Exception {
        solve(System.in, System.out);
    }

    static void solve(InputStream is, PrintStream os) {
        // Your code here!
        Scanner scan = new Scanner(is);
        long X = scan.nextLong();

        long depo = 100;
        int ans = 0;

        while(X > depo) {
            depo *= 1.01;
            ans++;
        }

        os.println(ans);
    }

} Main public static void main(String[] args) throws Exception {
        solve(System.in, System.out);
    } main {
        solve(System.in, System.out);
    } solve(System.in, System.out) solve System.in System System.in System.out System System.out String[] args args static void solve(InputStream is, PrintStream os) {
        // Your code here!
        Scanner scan = new Scanner(is);
        long X = scan.nextLong();

        long depo = 100;
        int ans = 0;

        while(X > depo) {
            depo *= 1.01;
            ans++;
        }

        os.println(ans);
    } solve {
        // Your code here!
        Scanner scan = new Scanner(is);
        long X = scan.nextLong();

        long depo = 100;
        int ans = 0;

        while(X > depo) {
            depo *= 1.01;
            ans++;
        }

        os.println(ans);
    } Scanner scan = new Scanner(is); scan new Scanner(is) long X = scan.nextLong(); X scan.nextLong() scan.nextLong scan long depo = 100; depo 100 int ans = 0; ans 0 while(X > depo) {
            depo *= 1.01;
            ans++;
        } X > depo X depo {
            depo *= 1.01;
            ans++;
        } depo *= 1.01 depo 1.01 ans++ ans os.println(ans) os.println os ans InputStream is is PrintStream os os public class Main {
    public static void main(String[] args) throws Exception {
        solve(System.in, System.out);
    }

    static void solve(InputStream is, PrintStream os) {
        // Your code here!
        Scanner scan = new Scanner(is);
        long X = scan.nextLong();

        long depo = 100;
        int ans = 0;

        while(X > depo) {
            depo *= 1.01;
            ans++;
        }

        os.println(ans);
    }

} public class Main {
    public static void main(String[] args) throws Exception {
        solve(System.in, System.out);
    }

    static void solve(InputStream is, PrintStream os) {
        // Your code here!
        Scanner scan = new Scanner(is);
        long X = scan.nextLong();

        long depo = 100;
        int ans = 0;

        while(X > depo) {
            depo *= 1.01;
            ans++;
        }

        os.println(ans);
    }

} Main

import java.io.InputStream;
import java.io.PrintStream;
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        solve(System.in, System.out);
    }

    static void solve(InputStream is, PrintStream os) {
        // Your code here!
        Scanner scan = new Scanner(is);
        long X = scan.nextLong();

        long depo = 100;
        int ans = 0;

        while(X > depo) {
            depo *= 1.01;
            ans++;
        }

        os.println(ans);
    }

}