import java.util.*;
public class Main{
  public static void main(String []args){
    Scanner sc=new Scanner(System.in);
    double t=100;
    int sum=0;
    long k=sc.nextLong();
    while(t<k){
      t= t+Math.floor(t*0.01);
      sum++;
    }
    System.out.println(sum);
  }
}

/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