#include <iostream>
using namespace std;

struct Diem {
    int x, y;
};

class Bai2 {
private:
    Diem* arr;
    int sl;
public:
    ~Bai2() {
        delete[] arr;
        sl = 0;
        arr = nullptr;
    }
    Bai2(int s = 0) {
        sl = s;
        arr = new Diem[sl];
    }
    void Nhap() {
        cin >> sl;
        arr = new Diem[sl];
        for (int i = 0; i < sl; i++) {
            cin >> arr[i].x >> arr[i].y;
        }
    }
    void Xuat() {
        for (int i = 0; i < sl; i++) {
            cout << "(" << arr[i].x << "," << arr[i].y << ")" << "\n";
        }
    }
    void DienTich_XacDinhChieu() {
        double tong = 0;
        for (int i = 0; i < sl; i++) {
            if (i + 1 == sl) tong += arr[i].x * arr[0].y - arr[0].x * arr[i].y;
            else tong += arr[i].x * arr[i + 1].y - arr[i + 1].x * arr[i].y;
        }
        cout << "Dien tich da giac: " << 0.5 * abs(tong) << "\n";
        if (tong > 0) cout << "Chieu cua da giac là chieu nguoc chieu kim dong ho!\n";
        else cout << "Chieu cua da giac là chieu cung chieu kim dong ho!\n";
    }
    void LoiHayLom() {
        bool duong = false;
        bool am = false;
        for (int i = 0; i < sl; i++) {
            Diem p1 = arr[(i - 1 + sl) % sl];
            Diem p2 = arr[i];
            Diem p3 = arr[(i + 1) % sl];
            int vectorX1 = p2.x - p1.x;
            int vectorY1 = p2.y - p1.y;
            int vectorX2 = p3.x - p2.x;
            int vectorY2 = p3.y - p2.y;
            int tch = vectorX1 * vectorY2 - vectorX2 * vectorY1;
            if (tch < 0) am = true;
            if (tch > 0) duong = true;
        }
        if (duong && am) cout << "Da giac nay la da giac lom!\n";
        else cout << "Da giac nay la da giac loi!\n";
    }
};

int main() {
    Bai2 a;
    a.Nhap();
    a.Xuat();
    a.DienTich_XacDinhChieu();
    a.LoiHayLom();
    return 0;
}