
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.Scanner;

public class Main {

  public static void main(String[] args) {

    Scanner sc = new Scanner(System.in);
    // 整数の入力
    long x = sc.nextLong();

    int year = 0;
    BigDecimal money = new BigDecimal(100);
    BigDecimal X = new BigDecimal(x);
    while (X.compareTo(money) > 0) {
      money = money.multiply(new BigDecimal("1.01")).setScale(0, RoundingMode.DOWN);
      year++;
    }

    // 出力
    System.out.println(year);
  }
}

/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