class Average {
        public static void main(String args[])
        {
            double number[] = {5.5, 10.1, 11, 12.8, 56.9, 2.5};
            double res;
            res = 0;
            for (int i = 0; i < 6; ++i) 
               {
                res = res + number[i];
               }
	    System.out.print(res/6);
 
        } 
    }