A tank is shot at by 3 independently acting anti-tank helicopters with one antitank missile each. Each missile hits the tank with probability 0.6 . If the tank is hit by 1 missile, it is put out of action with probability 0.8 . If the tank is hit by at least 2 missiles, it is put out of action with probability 1 .

What is the probability that the tank is put out of action by this attack?