acmp_12

#include <bits/stdc++.h>

using namespace std;

struct Point
{
    double x, y;
    Point(double x0 = 0, double y0 = 0) {
        x = x0;
        y = y0;
    }
};

istream & operator >> (istream & in, Point& P) {
    return in >> P.x >> P.y;
}

struct Vector
{
    double x, y;
    Vector(Point A, Point B) {
        y = B.y - A.y;
        x = B.x - A.x;
    }
    double len() {
        return sqrt(y * y + x * x);
    }
};

double cross_product(Vector& A, Vector& B) {
    return A.x * B.y - A.y * B.x;
}

int main()
{
    int n;
    cin >> n;
    int sum = 0;
    for (int i = 0; i < n; ++i) {
        Point F, A, B, C, D;
        cin >> F >> A >> B >> C >> D;
        Vector AF(A, F), BF(B, F), CF(C, F), DF(D, F), AB(A, B), BC(B, C), CD(C, D), DA(D, A);
        if (cross_product(AB, AF) >= 0 && cross_product(BC, BF) >= 0 && cross_product(CD, CF) >= 0 && cross_product(DA, DF) >= 0 || cross_product(AB, AF) <= 0 && cross_product(BC, BF) <= 0 && cross_product(CD, CF) <= 0 && cross_product(DA, DF) <= 0) {
            sum++;
        }
    }
    cout << sum;
    return 0;
}