import java.util.*;
class average
{
    public static void main(String args[])
    {
        Scanner sc = new Scanner (System.in);
        int m1 = sc.nextInt();
        int m2 = sc.nextInt();
        int m3 = sc.nextInt();
        int total = m1 + m2 + m3;
        double avg = total / 3;
        System.out.println("Average =" + avg);
    }
}