sensor

#include <iostream>

using namespace std;

int main()
{
	double mas[1000][2], tmp = 0, pre = 0, p = 0, n;
	cin >> n;
	for (int i = 0; i < 1000; i++)
	{
		for (int j = 0; j < 2; j++)
		{
			mas[i][j] = 0;
		}
	}
	for (int i = 0; i < n; i++)
	{
		for (int j = 0; j < 2; j++)
		{
			cin >> mas[i][j];
		}
	}
	for (int i = 0; i < n; i++)
	{
		tmp += mas[i][0];
		if (mas[i][0] >= -70 && mas[i][0] <= 80)
		{
			pre += mas[i][1];
			p++;
		}
	}

	printf("%.4lf", tmp/n);
	cout << " ";
	printf("%.4lf", pre/p);
	return 0;
}