import java.util.Scanner;
import java.io.File;
import java.io.PrintWriter;
import java.io.FileNotFoundException;
import java.lang.Exception;

class Oct29 {
	public static void main(String[] args) {

		Scanner input = null;

		try {
			input = new Scanner(new File("input1.txt"));
		} 
		catch(FileNotFoundException e) {
			System.out.println("file not found");
			e.printStackTrace();
		}
		

		int numGrades = input.nextInt();
		System.out.println("num grades: " + numGrades);
	
		int[] grades = new int[numGrades];

		readGrades(input, grades);	
		printArray(grades);

		double mean = computeMean(grades);
		System.out.println("mean: " + mean);	

		PrintWriter pw = null;

		try {
			pw = new PrintWriter("out1.txt");
		}
		catch (Exception e) {
			System.out.println("out file not found");
		}

		pw.println(mean);
		pw.close();
	}

	static double computeMean(int[] grades) {
		double sum = 0.0;
		for(int grade : grades) {
			sum += grade;
		}
		return (sum / grades.length);
	}

	static void readGrades(Scanner input, int[] grades) {
		for(int i = 0; i < grades.length; i++) {
			grades[i] = input.nextInt();
		}
	}

	static void printArray(int[] arr) {
		for(int elm : arr) {
			System.out.print(elm + " ");
		}
		System.out.println();
	}
}

// end of file