#include <fstream>
#include <cmath>
#define NMAX 500
#define int double
#define EPS 0.00001

using namespace std;

ifstream cin ("geometry.in");
ofstream cout ("geometry.out");

struct dreapta {
  int x1, y1, x2, y2;
};

dreapta v[NMAX + 1];

double get_dist(int x1, int y1, int x2, int y2) {
  return sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
}

bool is_in_segment(int x1, int y1, dreapta A) { /// stiu ca e segment
  cout << get_dist(x1, y1, A.x1, A.y1) + get_dist(x1, y1, A.x2, A.y2) - get_dist(A.x1, A.x1, A.x2, A.y2) << "\n";
  return get_dist(x1, y1, A.x1, A.y1) + get_dist(x1, y1, A.x2, A.y2) == get_dist(A.x1, A.x1, A.x2, A.y2);
}

bool solve(dreapta A, dreapta B) {
  double aA, bA, aB, bB, x1, y1;

  if (B.x1 == B.x2) {
    dreapta aux = A;
    A = B;
    B = aux;
  }

  if (A.x1 == A.x2) {
    if (B.x1 == B.x2) {
      if (A.x1 == B.x1) {
        if (A.y2 >= B.y1 && A.y2 <= B.y2)
          return 1;
        else if (B.y2 >= A.y1 && B.y2 <= A.y2)
          return 1;
        else
          return 0;
      }
      else
        return 0;
    }
    else {
      aB = (B.y1 - B.y2) / (B.x1 - B.x2);
      bB = B.y1 - aB * B.x1;

      x1 = A.x1;
      y1 = x1 * aB + bB;

      //cout << is_in_segment(x1, y1, A) << " " << is_in_segment(x1, y1, B) << "\n";

      return is_in_segment(x1, y1, A) & is_in_segment(x1, y1, B);
    }
  }

  aA = (A.y1 - A.y2) / (A.x1 - A.x2);
  bA = A.y1 - aA * A.x1;
  aB = (B.y1 - B.y2) / (B.x1 - B.x2);
  bB = B.y1 - aB * B.x1;

  x1 = (bB - bA) / (aA - aB);
  y1 = x1 * aA + bA;

  //cout << x1 << " " << y1 << "\n";

  return is_in_segment(x1, y1, A) & is_in_segment(x1, y1, B);
}

signed main() {
  int n, sol;
  signed i, j;
  cin >> n;

  for (i = 0; i < n; i++) {
    cin >> v[i].x1 >> v[i].y1 >> v[i].x2 >> v[i].y2;
  }

  sol = 0;
  for (i = 0; i < n; i++) {
    for (j = i + 1; j < n; j++) {
      sol += solve(v[i], v[j]);
    }
  }

  cout << sol;
  return 0;
}