import java.util.Scanner;
 
public class Main {
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    
    long X=sc.nextLong();
    int count=0;
    int N=100;
    double money=N;
    while (money<X) {
    	money=money*1.01;
    	money=Math.floor(money);
    	count++;
    }
    System.out.println(count);
    }}
/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