#include <bits/stdc++.h>
typedef struct Point {
  int x, y;
} Point;
Point p[305];
double area(Point a, Point b, Point c) {
  return a.x * b.y - b.x * a.y + b.x * c.y - c.x * b.y + c.x * a.y - a.x * c.y;
}
double max(double s1, double s2) { return s1 > s2 ? s1 : s2; }
int main() {
  int n;
  while (scanf("%d", &n) != EOF) {
    int i, j, k;
    double s1, s2, s3, s;
    for (i = 0; i < n; i++) scanf("%d %d", &p[i].x, &p[i].y);
    s3 = 0;
    for (i = 0; i < n; i++) {
      for (j = i + 1; j < n; j++) {
        s1 = s2 = 0;
        for (k = 0; k < n; k++) {
          if (k != i && k != j) {
            s = area(p[i], p[k], p[j]);
            if (s > 0)
              s1 = max(s1, fabs(s) / 2);
            else if (s < 0)
              s2 = max(s2, fabs(s) / 2);
          }
        }
        if (s1 != 0 && s2 != 0) s3 = max(s1 + s2, s3);
      }
    }
    printf("%.6lf\n", s3);
  }
  return 0;
}
