import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.Scanner;

/**
 *
 * @author =v
 */
public class main {
    public static void main (String[] args){
        Scanner sc = null;
        PrintWriter pw = null;
        try {
            pw = new PrintWriter("OUT4.txt");
            sc = new Scanner(new File("DATA4.txt"));
        } catch (FileNotFoundException ex) {
        }
        int num, count = 0;
        for (int i = 0; i < 5; i++){
            num = Integer.parseInt(sc.next());
            int[] x = new int[num];
            int[] y = new int[num];
            for (int j = 0; j < num; j++){
                x[j] = Integer.parseInt(sc.next());
                y[j] = Integer.parseInt(sc.next());
            }
            for (int j = 0; j < num; j++){
                for (int k = j + 1; k < num - 1; k++){
                    for (int l = k+ 1; l < num - 2; l++){
                        if ((x[j] > 0 && x[k] > 0 && x[l] > 0) || (x[j] < 0 && x[k] < 0 && x[l] < 0)){

                        } else if (((y[j] > 0 && y[k] > 0 && y[l] > 0))
                                || y[j] < 0 && y[k] < 0 && y[l] < 0){
                        } else {
                            count++;
                        }
                    }
                }
            }
            pw.println(count);
        }
        pw.close();
        sc.close();
    }
}