Dominika is secretly preparing homeopathics at home. She uses a cup filled with a solution of volume V0=200 ml and concentration of the active agent c0=0.001 M. She then pours away a half of this volume and fills the cup with water to the original volume V0. She repeats this process 70 times. Statistically speaking, how many molecules of the active agent are left in the cup at the end? Assume that the solution and water are always perfectly mixed.