#include <bits/stdc++.h>
using namespace std;
struct Point {
  double x, y;
};
double area(Point a, Point b, Point c) {
  return 0.5 * (a.x * b.y + b.x * c.y + c.x * a.y - a.y * b.x - b.y * c.x -
                c.y * a.x);
}
bool ccw(Point a, Point b, Point c) { return area(a, b, c) > 0; }
int main() {
  int n;
  while (scanf("%d", &n) != EOF) {
    Point arr[n];
    for (int i = 0; i < n; i++) scanf("%lf %lf", &arr[i].x, &arr[i].y);
    double ans = 0;
    for (int i = 0; i < n; i++) {
      for (int j = i + 1; j < n; j++) {
        double x = 0, y = 0;
        for (int k = 0; k < n; k++) {
          if (k == i || k == j) continue;
          double temp = abs(area(arr[i], arr[k], arr[j]));
          if (ccw(arr[i], arr[k], arr[j])) {
            x = max(x, temp);
          } else
            y = max(y, temp);
        }
        if (abs(x) < 1e-10 || abs(y) < 1e-10) continue;
        ans = max(ans, x + y);
      }
    }
    printf("%.6f\n", ans);
  }
}
