#include <bits/stdc++.h>
using namespace std;
template <typename TH>
void _dbg(const char* sdbg, TH h) {
  cerr << sdbg << "=" << h << "\n";
}
template <typename TH, typename... TA>
void _dbg(const char* sdbg, TH h, TA... t) {
  while (*sdbg != ',') cerr << *sdbg++;
  cerr << "=" << h << ",";
  _dbg(sdbg + 1, t...);
}
template <class C>
void mini(C& a4, C b4) {
  a4 = min(a4, b4);
}
template <class C>
void maxi(C& a4, C b4) {
  a4 = max(a4, b4);
}
template <class T1, class T2>
ostream& operator<<(ostream& out, pair<T1, T2> pair) {
  return out << "(" << pair.first << ", " << pair.second << ")";
}
template <class A, class B, class C>
struct Triple {
  A first;
  B second;
  C third;
  bool operator<(const Triple& t) const {
    if (first != t.first) return first < t.first;
    if (second != t.second) return second < t.second;
    return third < t.third;
  }
};
template <class T>
void ResizeVec(T&, vector<long long>) {}
template <class T>
void ResizeVec(vector<T>& vec, vector<long long> sz) {
  vec.resize(sz[0]);
  sz.erase(sz.begin());
  if (sz.empty()) {
    return;
  }
  for (T& v : vec) {
    ResizeVec(v, sz);
  }
}
template <class A, class B, class C>
ostream& operator<<(ostream& out, Triple<A, B, C> t) {
  return out << "(" << t.first << ", " << t.second << ", " << t.third << ")";
}
template <class T>
ostream& operator<<(ostream& out, vector<T> vec) {
  out << "(";
  for (auto& v : vec) out << v << ", ";
  return out << ")";
}
template <class T>
ostream& operator<<(ostream& out, set<T> vec) {
  out << "(";
  for (auto& v : vec) out << v << ", ";
  return out << ")";
}
template <class L, class R>
ostream& operator<<(ostream& out, map<L, R> vec) {
  out << "(";
  for (auto& v : vec) out << v << ", ";
  return out << ")";
}
struct Point {
  long long x, y;
  Point operator-(Point p) { return {x - p.x, y - p.y}; }
};
const long long N = 2222;
Point pt[N];
bool InUpper(Point p) { return p.y > 0 || (p.y == 0 && p.x > 0); }
long long CrossProd(Point A, Point B) { return A.x * B.y - A.y * B.x; }
long long C2(long long x) { return x * (x - 1) / 2; }
int32_t main() {
  ios_base::sync_with_stdio(0);
  cout << fixed << setprecision(10);
  if (0) cout << fixed << setprecision(10);
  cin.tie(0);
  long long n;
  cin >> n;
  for (long long i = (1); i <= (n); ++i) {
    long long x, y;
    cin >> x >> y;
    pt[i] = {x, y};
  }
  long long res = 0;
  Point orig{0, 0};
  for (long long i = (1); i <= (n); ++i) {
    Point cp = pt[i];
    vector<pair<Point, long long>> evs;
    long long cnt_upper = 0;
    for (long long j = (1); j <= (n); ++j) {
      pt[j] = pt[j] - cp;
      cnt_upper += InUpper(pt[j]);
      if (i != j) {
        evs.push_back({pt[j], 1});
        evs.push_back({orig - pt[j], -1});
      }
    }
    sort((evs).begin(), (evs).end(),
         [&](pair<Point, long long>& A, pair<Point, long long>& B) {
           long long au = InUpper(A.first);
           long long bu = InUpper(B.first);
           if (au != bu) {
             return au > bu;
           }
           return CrossProd(A.first, B.first) > 0;
         });
    long long res_here = 0;
    for (auto ev : evs) {
      if (ev.second == 1) {
        long long lower = n - 1 - cnt_upper;
        long long add = C2(cnt_upper - 1) * C2(lower);
        res += add;
        res_here += add;
        cnt_upper--;
      } else {
        cnt_upper++;
      }
    }
    (i, res_here);
  }
  (res);
  assert(res % 2 == 0);
  cout << res / 2 << endl;
  return 0;
}
