import java.io.* ;
public class area {
   static long det(int[][] m) {
      return m[0][0] * (m[1][1] * (long)m[2][2] - m[1][2] * (long)m[2][1]) +
             m[0][1] * (m[1][2] * (long)m[2][0] - m[1][0] * (long)m[2][2]) +
             m[0][2] * (m[1][0] * (long)m[2][1] - m[1][1] * (long)m[2][0]) ;
   }
   static int[] sub(int[] a, int[] b) {
      int[] r = new int[a.length] ;
      for (int i=0; i<a.length; i++)
         r[i] = a[i] - b[i] ;
      return r ;
   }
   static double dist(int[] v) {
      double r = 0 ;
      for (int a : v)
         r += a * (double)a ;
      return Math.sqrt(r) ;
   }
   static double triarea(double a, double b, double c) {
      double s = (a + b + c) / 2 ;
      return Math.sqrt(s*(s-a)*(s-b)*(s-c)) ;
   }
   public static void main(String[] args) throws Exception {
      BufferedReader br = new BufferedReader(new InputStreamReader(System.in)) ;
      while (true) {
         String[] f = br.readLine().split(" ") ;
         int n = Integer.parseInt(f[0]) ;
         if (n == 0)
            break ;
         int[][] pts = new int[n][3] ;
         for (int i=0; i<n; i++) {
            f = br.readLine().split(" ") ;
            for (int j=0; j<3; j++)
               pts[i][j] = Integer.parseInt(f[j]) ;
         }
         double r = 0 ;
         for (int a=0; a<n; a++)
            for (int b=a+1; b<n; b++)
               for (int c=b+1; c<n; c++) {
                  int neg=0, pos=0, zero=0 ;
                  int[][] mat = new int[3][] ;
                  mat[0] = sub(pts[b], pts[a]) ;
                  mat[1] = sub(pts[c], pts[a]) ;
                  if (mat[0][0] * mat[1][1] == mat[0][1] * mat[1][0] &&
                      mat[0][0] * mat[1][2] == mat[0][2] * mat[1][0] &&
                      mat[0][1] * mat[1][2] == mat[0][2] * mat[1][1])
                     continue ;
                  for (int[] d : pts) {
                     mat[2] = sub(d, pts[a]) ;
                     long dd = det(mat) ;
                     if (dd < 0) neg++ ;
                     else if (dd > 0) pos++ ;
                     else zero++ ;
                  }
                  if (neg == 0 || pos == 0) { // face
                     if (zero != 3)
                        throw new Exception("Points on face is " + zero) ;
                     r += triarea(dist(mat[0]), dist(mat[1]),
                                  dist(sub(pts[b], pts[c]))) ;
                  }
               }
         System.out.println((long)Math.floor(r+0.5)) ;
      }
   }
}