import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        
        Scanner sc = new Scanner(System.in);
        String line1 = sc.nextLine();
        
        double x = Double.parseDouble(line1);
        
        long yokin = 100;
        int count = 0;
        while(yokin < x)
        {
            yokin = yokin + (long)(yokin * 0.01);
            count++;
        }
        
        System.out.println(count);
    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) throws Exception {
        
        Scanner sc = new Scanner(System.in);
        String line1 = sc.nextLine();
        
        double x = Double.parseDouble(line1);
        
        long yokin = 100;
        int count = 0;
        while(yokin < x)
        {
            yokin = yokin + (long)(yokin * 0.01);
            count++;
        }
        
        System.out.println(count);
    }
} Main public static void main(String[] args) throws Exception {
        
        Scanner sc = new Scanner(System.in);
        String line1 = sc.nextLine();
        
        double x = Double.parseDouble(line1);
        
        long yokin = 100;
        int count = 0;
        while(yokin < x)
        {
            yokin = yokin + (long)(yokin * 0.01);
            count++;
        }
        
        System.out.println(count);
    } main {
        
        Scanner sc = new Scanner(System.in);
        String line1 = sc.nextLine();
        
        double x = Double.parseDouble(line1);
        
        long yokin = 100;
        int count = 0;
        while(yokin < x)
        {
            yokin = yokin + (long)(yokin * 0.01);
            count++;
        }
        
        System.out.println(count);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String line1 = sc.nextLine(); line1 sc.nextLine() sc.nextLine sc double x = Double.parseDouble(line1); x Double.parseDouble(line1) Double.parseDouble Double line1 long yokin = 100; yokin 100 int count = 0; count 0 while(yokin < x)
        {
            yokin = yokin + (long)(yokin * 0.01);
            count++;
        } yokin < x yokin x {
            yokin = yokin + (long)(yokin * 0.01);
            count++;
        } yokin = yokin + (long)(yokin * 0.01) yokin yokin + (long)(yokin * 0.01) yokin (long)(yokin * 0.01) yokin 0.01 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 {
        
        Scanner sc = new Scanner(System.in);
        String line1 = sc.nextLine();
        
        double x = Double.parseDouble(line1);
        
        long yokin = 100;
        int count = 0;
        while(yokin < x)
        {
            yokin = yokin + (long)(yokin * 0.01);
            count++;
        }
        
        System.out.println(count);
    }
} public class Main {
    public static void main(String[] args) throws Exception {
        
        Scanner sc = new Scanner(System.in);
        String line1 = sc.nextLine();
        
        double x = Double.parseDouble(line1);
        
        long yokin = 100;
        int count = 0;
        while(yokin < x)
        {
            yokin = yokin + (long)(yokin * 0.01);
            count++;
        }
        
        System.out.println(count);
    }
} Main
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        
        Scanner sc = new Scanner(System.in);
        String line1 = sc.nextLine();
        
        double x = Double.parseDouble(line1);
        
        long yokin = 100;
        int count = 0;
        while(yokin < x)
        {
            yokin = yokin + (long)(yokin * 0.01);
            count++;
        }
        
        System.out.println(count);
    }
}
