import java.util.Scanner;

public class Main {
    public static void main(String[] args){
       Scanner sc = new Scanner(System.in);
       long f = 100;
       int answer = 0;
       long x = sc.nextLong();
       while(x > f){
           f += f / 100;
           answer++;
       }
       System.out.println(answer); 
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz