import java.util.*;

public class Main {
    public static void main(String[] args) {
        long count =0;
        long kazu=0;
        long number=100;
        Scanner scan = new Scanner(System.in);
        String a = scan.next();
        long n=Long.parseLong(a);
        while (true){
          number=(long)(1.01*number);
          //System.out.println(number);
          count++;
          if(number>=n){
              break;
          }
        }
        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