public class Problem5
{
  public static void main(String[] args)
  {
    double sugar = 100;
    double alcohol = 0;
    double vinegar = 0;
    double totalAlcohol = 0;
    double maxAlcohol = 0;
    int day = 0;

    while (true) {

      alcohol = 0.10 * sugar;
      totalAlcohol += alcohol;

      sugar -= alcohol;
      vinegar = (0.01 * totalAlcohol);

      totalAlcohol-=vinegar;

      if (maxAlcohol < totalAlcohol) {
        maxAlcohol = totalAlcohol;
        day++;
      }
      else {
        break;
      }
    }
    System.out.println(day);
  }
}