#include <cstdlib>
#include <iostream>
#include <stdio.h>
#include <cstring>
#include <vector>
#include <algorithm>
#include <utility>
#include <queue>
#include <map>
#include <stack>
#include <cmath>
#include <set>
#include <ctype.h>
#include <bitset>

#define INF 0x3F3F3F3F
#define rep(i, a, b) for (int i = int(a); i < int(b); i++)
#define TRvii(c, it) for (vii::iterator it = (c).begin(); it != (c).end(); it++)
#define tr(it, s)  for ( typeof ( s.begin( ) ) it=s.begin( ); it!=s.end( ); it++ )
#define pb push_back
#define clr(a) memset((a),0,sizeof(a))
#define pi 3.1415926535897932384626433832795028841971
#define debug(x) cout << #x << " = " << x << endl;
#define debug2(x,y) cout << #x << " = " << x << " --- " << #y << " " << y << "\n";
#define all(S) (S).begin(), (S).end()
#define MAXV 1005
#define F first
#define S second
#define EPS 1e-9

using namespace std;

typedef long long ll;
typedef pair < int, int >  ii;
typedef vector < int >  vi;
typedef vector < ii >  vii;

struct point{
    double x, y;
    point (double _x=0, double _y=0) : x(_x), y(_y) {};

    point operator -(point q) { return point( x-q.x, y-q.y); }
    double operator %(point q) { return x*q.y - y*q.x; }
};

double ccw(point i, point j, point k){
    point U = j-i, V = k-i; double ans = U % V;
    return ans;
}

double dist_pt(point a, point b){
    return sqrt((b.x-a.x)*(b.x-a.x) + (b.y-a.y)*(b.y-a.y));
}


int n;
point p[101];

int main(){

    int x, y;
    double sn, sp, ans;

    while(scanf("%d",&n) && n){

            rep(i,0,n){
                scanf("%d%d",&x,&y);
                p[i].x = x; p[i].y = y;
            }

            ans = INF;

            point a, b, r;

            rep(i,0,n){
                   a.x = p[i].x; a.y = p[i].y;
                   rep(j,i+1,n){
                        b.x = p[j].x; b.y = p[j].y;
                        sn = sp = 0;
                        rep(k,0,n){

                            r.x = p[k].x; r.y = p[k].y;

                            double area = ccw(a, b, r);
                            double base = dist_pt(a,b);
                            double alt = area/base;

                            if(area < 0) sn += alt;
                            else if(area > 0) sp += alt;

                        }

                        ans = min(ans, abs(sn+sp));
                   }
            }

            printf("%.3lf\n",ans);
    }

    return 0;
}