#include <iostream>
using namespace std;

const int SIZE = 5;

int main()
{
	int scores[SIZE] = {0};

	int sum = 0;
	double average = 0.0;
	int i = 0;

	for (i = 0; i < SIZE; i++)
	{
		cout << "Enter next grade: ";
		cin >> scores[i];
		sum = sum + scores[i];
	}

	average =  (double) sum  / SIZE;

	cout << average << endl;

	return 0;
}