import java.util.Scanner;

class Numbers {
	final public static int MAX = 20;
	int []numbers;

	int readInNumbers() {
		// Read as many numbers as given on stdin
		// and return the count of numbers.
		// Maximum numbers that can be taken is MAX
		int i=0;
		Scanner in = new Scanner(System.in);
		numbers = new int[MAX];
		while ((i<MAX) && (in.hasNextInt()))
			numbers[i++] = in.nextInt();
		return i;
	}
	int sumOfNumbers(int sz) {
		int i, s = 0;
		for (i = 0, s = 0; i<sz; i++)
			s = s + numbers[i];
		return s;
	}
}

public class Average {
	public static void main(String args[]) {
		Numbers nums = new Numbers();
		int sz;
		System.out.println("Type in up to " + Numbers.MAX + " integers");
		sz = nums.readInNumbers();
		if (sz == 0) {
			System.err.println("Not Enough Numbers");
			return;
		}
		System.out.println("Average: " + (double)(nums.sumOfNumbers(sz))/
				(double)sz);
	}
}