#include <bits/stdc++.h>
using namespace std;
int dx[] = {0, 1, -1, 0};
int dy[] = {1, 0, 0, -1};
long long pw(long long b, long long p) {
  if (!p) return 1;
  long long sq = pw(b, p / 2);
  sq *= sq;
  if (p % 2) sq *= b;
  return sq;
}
const int N = 302, M = (N << 1);
int x[N], y[N];
int main() {
  ios::sync_with_stdio(false);
  cin.tie(NULL);
  int n;
  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> x[i] >> y[i];
  }
  double res = 0;
  for (int i = 0; i < n - 1; i++) {
    for (int j = i + 1; j < n; j++) {
      double mxl = 0, mxr = 0;
      for (int k = 0; k < n; k++) {
        if (i == k || j == k) continue;
        double area =
            ((x[i] - x[k]) * (y[j] - y[k]) - (y[i] - y[k]) * (x[j] - x[k])) /
            2.0;
        if (area > 0) mxl = max(mxl, area);
        if (area < 0) mxr = max(mxr, -area);
        if (mxl != 0 && mxr != 0) {
          res = max(res, mxl + mxr);
        }
      }
    }
  }
  cout << fixed << setprecision(6) << res;
  return 0;
}
