import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc=new Scanner(System.in);
        long X=sc.nextLong();
        
        long now=100;
        int count=0;
        
        while(now<X){
            now*=1.01;
            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);
        long X=sc.nextLong();
        
        long now=100;
        int count=0;
        
        while(now<X){
            now*=1.01;
            count++;
        }
        System.out.println(count);
    }
} Main public static void main(String[] args) throws Exception {
        Scanner sc=new Scanner(System.in);
        long X=sc.nextLong();
        
        long now=100;
        int count=0;
        
        while(now<X){
            now*=1.01;
            count++;
        }
        System.out.println(count);
    } main {
        Scanner sc=new Scanner(System.in);
        long X=sc.nextLong();
        
        long now=100;
        int count=0;
        
        while(now<X){
            now*=1.01;
            count++;
        }
        System.out.println(count);
    } Scanner sc=new Scanner(System.in); sc new Scanner(System.in) long X=sc.nextLong(); X sc.nextLong() sc.nextLong sc long now=100; now 100 int count=0; count 0 while(now<X){
            now*=1.01;
            count++;
        } now<X now X {
            now*=1.01;
            count++;
        } now*=1.01 now 1.01 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);
        long X=sc.nextLong();
        
        long now=100;
        int count=0;
        
        while(now<X){
            now*=1.01;
            count++;
        }
        System.out.println(count);
    }
} public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc=new Scanner(System.in);
        long X=sc.nextLong();
        
        long now=100;
        int count=0;
        
        while(now<X){
            now*=1.01;
            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);
        long X=sc.nextLong();
        
        long now=100;
        int count=0;
        
        while(now<X){
            now*=1.01;
            count++;
        }
        System.out.println(count);
    }
}
