#include <bits/stdc++.h>
using namespace std;
int n, kq;
pair<int, int> a[305];
int CCW(int x, int y, int z) {
  int tong = 0;
  tong += (a[y].first - a[x].first) * (a[y].second + a[x].second);
  tong += (a[z].first - a[y].first) * (a[z].second + a[y].second);
  tong += (a[x].first - a[z].first) * (a[x].second + a[z].second);
  return tong;
}
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  cin >> n;
  for (int i = 1; i <= n; i++) cin >> a[i].first >> a[i].second;
  for (int i = 1; i <= n - 1; i++)
    for (int j = i + 1; j <= n; j++) {
      int res = -1000000000, res1 = -1000000000;
      for (int t = 1; t <= n; t++)
        if (CCW(i, j, t) < 0) res = max(res, -CCW(i, j, t));
      for (int t = 1; t <= n; t++)
        if (CCW(i, j, t) > 0) res1 = max(res1, CCW(i, j, t));
      kq = max(kq, res + res1);
    }
  cout << kq / 2;
  if (kq % 2 == 1) cout << ".5";
}
