const

   s = 20;{поменять на 100 для второй задачи}

var

   days: integer;

   distance, day_distance: real;

begin

   days := 1;

   day_distance := 10;

   distance := day_distance;

   repeat

       day_distance := day_distance * 1.1;

       distance := distance + day_distance;

       days := days + 1;

   until distance >= s;

   writeln(days);

end.