import java.util.Scanner;
 
public class Main{
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        double num1 = scan.nextDouble();
        double mny = 100;
        double risoku = 1.01;
            
        int cnt;    
        for(cnt=0;mny<num1;cnt++){
            long mny2 = (long)(mny*risoku);
            mny = mny2;
            }
        System.out.println(cnt);
        scan.close();
    }
} import java.util.Scanner; Scanner java.util public class Main{
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        double num1 = scan.nextDouble();
        double mny = 100;
        double risoku = 1.01;
            
        int cnt;    
        for(cnt=0;mny<num1;cnt++){
            long mny2 = (long)(mny*risoku);
            mny = mny2;
            }
        System.out.println(cnt);
        scan.close();
    }
} Main public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        double num1 = scan.nextDouble();
        double mny = 100;
        double risoku = 1.01;
            
        int cnt;    
        for(cnt=0;mny<num1;cnt++){
            long mny2 = (long)(mny*risoku);
            mny = mny2;
            }
        System.out.println(cnt);
        scan.close();
    } main {
        Scanner scan = new Scanner(System.in);
        double num1 = scan.nextDouble();
        double mny = 100;
        double risoku = 1.01;
            
        int cnt;    
        for(cnt=0;mny<num1;cnt++){
            long mny2 = (long)(mny*risoku);
            mny = mny2;
            }
        System.out.println(cnt);
        scan.close();
    } Scanner scan = new Scanner(System.in); scan new Scanner(System.in) double num1 = scan.nextDouble(); num1 scan.nextDouble() scan.nextDouble scan double mny = 100; mny 100 double risoku = 1.01; risoku 1.01 int cnt; cnt for(cnt=0;mny<num1;cnt++){
            long mny2 = (long)(mny*risoku);
            mny = mny2;
            } cnt=0; cnt=0 cnt 0 mny<num1 mny num1 cnt++ cnt++ cnt {
            long mny2 = (long)(mny*risoku);
            mny = mny2;
            } {
            long mny2 = (long)(mny*risoku);
            mny = mny2;
            } long mny2 = (long)(mny*risoku); mny2 (long)(mny*risoku) mny risoku mny = mny2 mny mny2 System.out.println(cnt) System.out.println System.out System System.out cnt scan.close() scan.close scan String[] args args public class Main{
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        double num1 = scan.nextDouble();
        double mny = 100;
        double risoku = 1.01;
            
        int cnt;    
        for(cnt=0;mny<num1;cnt++){
            long mny2 = (long)(mny*risoku);
            mny = mny2;
            }
        System.out.println(cnt);
        scan.close();
    }
} public class Main{
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        double num1 = scan.nextDouble();
        double mny = 100;
        double risoku = 1.01;
            
        int cnt;    
        for(cnt=0;mny<num1;cnt++){
            long mny2 = (long)(mny*risoku);
            mny = mny2;
            }
        System.out.println(cnt);
        scan.close();
    }
} Main
import java.util.Scanner;
 
public class Main{
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        double num1 = scan.nextDouble();
        double mny = 100;
        double risoku = 1.01;
            
        int cnt;    
        for(cnt=0;mny<num1;cnt++){
            long mny2 = (long)(mny*risoku);
            mny = mny2;
            }
        System.out.println(cnt);
        scan.close();
    }
}