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public class Main
{

    class Point {
        int x;
        int y;
    }

	public static void main(String[] args) {

		int n;
		Scanner in = new Scanner(System.in);
		n = in.nextInt();

		ArrayList<Point> points = new ArrayList();
		for (int i = 0; i < n; i++) {
		    x = in.nextInt();
		    y = in.nextInt();
		    Point point = new Point();
		    point.x = x;
		    point.y = y;
		    points.add(point);
		}

		Point result = new Point();
		int maxY = -10000000;
		if (n % 2 == 0) {
		    for (int i = 0; i < points.size(); i++) {
                if (points.y > maxY) {
                    result = points.get(i);
                }
            }
            double otvet;
            for (int i = 0; i < points.size(); i++) {
                if (result.y = maxY) {
                    if (points.get(i).x < result.x) {
                        otvet = points.get(i).x + (result.x - points.get(i).x) / 2;
                    } else {
                        otvet = result.x + (points.get(i).x - result.x) / 2;
                    }
                    System.out.print(otvet);
                }
            }
		} else {
		    maxY = -10000000;
		    for (int i = 0; i < points.size(); i++) {
                if (points.get(i).y > maxY) {
                    result = points.get(i);
                }
            }
            System.out.print(result.x);
		}

	}
}