#include <iostream>
using namespace std;

int main (void)
{
	int sum = 0;
	int counter = 0;
	counter++;
	int input = 0;
	cout << "Enter in a series of numbers in order to find the average." << endl;
	cout << "Entering a negative number will stop the series." << endl;

	do
	{
		cin >> input;
		sum += input;
	}
	while(input >=0);

		cout << "The average is: " << sum/counter  << endl;


	return 0;
}