#include <iostream>
using namespace std;

int main()
{
	int scores[5] = {0};

	int sum = 0;
	double average = 0.0;

	cout << "Enter next grade: ";
	cin >> scores[0];

	cout << "Enter next grade: ";
	cin >> scores[1];

	cout << "Enter next grade: ";
	cin >> scores[2];

	cout << "Enter next grade: ";
	cin >> scores[3];

	cout << "Enter next grade: ";
	cin >> scores[4];


	sum = scores[0] + scores[1] + scores[2] + scores[3] + scores[4];

	average = sum / 5.0;

	cout << average << endl;
	return 0;
}