#include <iostream>
#include <istream>
#include <ostream>
#include <cmath>
#include <vector>
using namespace std;
struct Point {
    double x = 0, y = 0;
    Point() {
        x = 0;
        y = 0;
    }
    Point(double a, double b) {
        x = a;
        y = b;
    }
};
struct Vector {
    double x, y;

    Vector(Point A, Point B) {
        x = B.x - A.x;
        y = B.y - A.y;
    }
};
long double operator ^ (Vector v1, Vector v2) {
    return v1.x * v2.y - v1.y * v2.x;
}

istream & operator>> (istream & in, Point & P) {
    in >> P.x >> P.y;
    return in;
}
ostream & operator<< (ostream & out, Point & P) {
    out << P.x << " " << P.y;
    return out;
}
long double square(int n, vector<Point> points) {
    long double s = 0;
    for (int i = 1; i < n - 1; i++) {
        s += Vector(points[i], points[0]) ^ Vector(points[0], points[i + 1]);
    }
    s /= 2;
    return abs(s);
}
int main() {
    int n;
    Point a;
    cin >> n >> a;
    vector <Point> points(n + 1);
    for (int i = 0; i < n; i++) {
        cin >> points[i];
    }
    long double s1 = square(n, points);
    for (int i = n; i >= 1; i--){
        points[i] = points[i - 1];

    }
    points[0] = a;
    long double s2 = square(n + 1, points);
    cout << s1 << ' ' << s2 << '\n';
    return 0;
}