//Sample09_42.java
class Sample09_42 {
    public static void main(String[] args){

      int num_of_value = 4;
      int a = 81;
      int b = 64;
      int c = 84;
      int d = 76;

      double avg = (a + b + c + d)/(double)num_of_value;

      System.out.println("avg= " + avg);
    }
}