#include <iostream>
#include <vector>
#include <cmath>
#include <algorithm>
 
using namespace std;
 
struct Point {
    int x, y;
};
 
int calculateArea(const Point& p1, const Point& p2, const Point& p3) {
    return abs((p1.x * (p2.y - p3.y) + p2.x * (p3.y - p1.y) + p3.x * (p1.y - p2.y)) / 2);
}
 
bool comparePoints(const Point& p1, const Point& p2) {
    return (p1.x < p2.x) || (p1.x == p2.x && p1.y < p2.y);
}
 
int findMaxArea(vector<Point>& points, int n) {
    int maxArea = 0;
 
    sort(points.begin(), points.end(), comparePoints);
 
    for (int i = 0; i < n - 2; ++i) {
        for (int j = i + 1; j < n - 1; ++j) {
            for (int k = j + 1; k < n; ++k) {
                int area = calculateArea(points[i], points[j], points[k]);
                maxArea = max(maxArea, area);
            }
        }
    }
 
    return maxArea;
}
 
int main() {
   // freopen("POLY4MAX.INP", "r", stdin);
   // freopen("POLY4MAX.OUT", "w", stdout);
 
    int n;
    cin >> n;
 
    vector<Point> points(n);
    for (int i = 0; i < n; ++i) {
        cin >> points[i].x >> points[i].y;
    }
 
    int maxArea = findMaxArea(points, n);
 
    cout << maxArea << ".0";  // Write the result with 1 decimal place
 
    return 0;
}
 

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2 1
2 3
5 7
8 3
8 1
5 0