public class NoArray {
    public static void main(String[] args) {
        int mary = 5;
        int fran = 6;
        int yen = 10;
        int sum = 0;
        sum += mary;
        sum += fran;
        sum += yen;
        double average = ((double) sum) / 3;
        System.out.println(average);
    }    
}