int input = -1;

int total = 0, numInput = 0, max = 0, min = 0;

while ((input = keyboard.nextInt()) != 0) {
  numInput ++;
  total += input;
  if (max == 0 || input > max)
    max = input;
  if (min == 0 || input < min)
    min = input;
}

System.out.println ("Max: " + max + " Min: " + min + " Average: " + (double) (total / numInput));