import java.util.Scanner;
import java.util.Arrays;

public class Main{
public static void main(String[] args){
Scanner scan=new Scanner(System.in);
long x=scan.nextLong();

int i=0;
long n=100;
while(n<x){
    n=n+n/100;
    i=i+1;
}

System.out.println(i);


}
} import java.util.Scanner; Scanner java.util import java.util.Arrays; Arrays java.util public class Main{
public static void main(String[] args){
Scanner scan=new Scanner(System.in);
long x=scan.nextLong();

int i=0;
long n=100;
while(n<x){
    n=n+n/100;
    i=i+1;
}

System.out.println(i);


}
} Main public static void main(String[] args){
Scanner scan=new Scanner(System.in);
long x=scan.nextLong();

int i=0;
long n=100;
while(n<x){
    n=n+n/100;
    i=i+1;
}

System.out.println(i);


} main {
Scanner scan=new Scanner(System.in);
long x=scan.nextLong();

int i=0;
long n=100;
while(n<x){
    n=n+n/100;
    i=i+1;
}

System.out.println(i);


} Scanner scan=new Scanner(System.in); scan new Scanner(System.in) long x=scan.nextLong(); x scan.nextLong() scan.nextLong scan int i=0; i 0 long n=100; n 100 while(n<x){
    n=n+n/100;
    i=i+1;
} n<x n x {
    n=n+n/100;
    i=i+1;
} n=n+n/100 n n+n/100 n n/100 n 100 i=i+1 i i+1 i 1 System.out.println(i) System.out.println System.out System System.out i String[] args args public class Main{
public static void main(String[] args){
Scanner scan=new Scanner(System.in);
long x=scan.nextLong();

int i=0;
long n=100;
while(n<x){
    n=n+n/100;
    i=i+1;
}

System.out.println(i);


}
} public class Main{
public static void main(String[] args){
Scanner scan=new Scanner(System.in);
long x=scan.nextLong();

int i=0;
long n=100;
while(n<x){
    n=n+n/100;
    i=i+1;
}

System.out.println(i);


}
} Main
import java.util.Scanner;
import java.util.Arrays;

public class Main{
public static void main(String[] args){
Scanner scan=new Scanner(System.in);
long x=scan.nextLong();

int i=0;
long n=100;
while(n<x){
    n=n+n/100;
    i=i+1;
}

System.out.println(i);


}
}