import java.util.*;

class Calculator {
    private int[] counts;

    public Calculator(int[] counts) {
        this.counts = counts;
    }
    public void divideCounts(int divisor) {
        if (divisor == 0) {
            throw new ArithmeticException();
        }
        for (int count : counts) {
            System.out.print(count / divisor + " ");
        }
        System.out.println();
    }
    public void getCountAtIndex(int index) {
        System.out.println(counts[index]);
    }
    public void averageCount() {
        double sum = 0;
        for (int count : counts) {
            sum += count;
        }
        double avg = sum / counts.length;
        System.out.println(avg);
    }
}
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        try {
            int n = sc.nextInt();
            int[] counts = new int[n];
            for (int i = 0; i < n; i++) {
                counts[i] = sc.nextInt();
            }
            int divisor = sc.nextInt();
            int index = sc.nextInt();
            Calculator calc = new Calculator(counts);
            calc.divideCounts(divisor);
            calc.getCountAtIndex(index);
            calc.averageCount();
        } catch (Exception e) {
            System.out.println("Invalid input");
        }
    }
}