import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    long originalMoney = 100;
    long goalMoney = sc.nextLong();

    int count = 0;
    boolean flg = true;

    while(flg) {
      originalMoney *= 1.01;
      count++;
      if(originalMoney >= goalMoney) {
        flg = false;
        System.out.println(count);
      }
    }
    sc.close();
  }
}
/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