#include <cstdio>

 #include <iostream>

 #include <algorithm>

 #include <cstring>

 #include <cmath>

 using namespace std;

 const double EPS = 1e-;

 const int N = ;

 inline int sgn(double x) { return (x > EPS) - (x < -EPS);}

 struct Point {

     double x, y, z;

     Point() {}

     Point(double x, double y, double z) : x(x), y(y), z(z) {}

     bool operator < (Point a) const {

         if (sgn(x - a.x)) return x < a.x;

         if (sgn(y - a.y)) return y < a.y;

         return z < a.z;

     }

     bool operator == (Point a) const { return !sgn(x - a.x) && !sgn(y - a.y) && !sgn(z - a.z);}

     Point operator + (Point a) { return Point(x + a.x, y + a.y, z + a.z);}

     Point operator - (Point a) { return Point(x - a.x, y - a.y, z - a.z);}

     Point operator * (double p) { return Point(x * p, y * p, z * p);}

     Point operator / (double p) { return Point(x / p, y / p, z / p);}

 } ;

 inline double dot(Point a, Point b) { return a.x * b.x + a.y * b.y + a.z * b.z;}

 inline double dot(Point o, Point a, Point b) { return dot(a - o, b - o);}

 inline Point cross(Point a, Point b) { return Point(a.y * b.z - a.z * b.y, a.z * b.x - a.x * b.z, a.x * b.y - a.y * b.x);}

 inline Point cross(Point o, Point a, Point b) { return cross(a - o, b - o);}

 inline double veclen(Point x) { return sqrt(dot(x, x));}

 inline double area(Point o, Point a, Point b) { return veclen(cross(o, a, b)) / 2.0;}

 inline double volume(Point o, Point a, Point b, Point c) { return dot(cross(o, a, b), c - o) / 6.0;}

 struct _3DCH{

     Point pt[N];

     int pcnt;

     struct Face {

         int a, b, c;

         bool ok;

         Face() {}

         Face(int a, int b, int c) : a(a), b(b), c(c) { ok = true;}

     } fc[N << ];

     int fcnt;

     int fid[N][N];

     bool outside(int p, int a, int b, int c) { return sgn(volume(pt[a], pt[b], pt[c], pt[p])) < ;}

     bool outside(int p, int f) { return outside(p, fc[f].a, fc[f].b, fc[f].c);}

     void addface(int a, int b, int c, int d) {

         if (outside(d, a, b, c)) fc[fcnt] = Face(c, b, a), fid[c][b] = fid[b][a] = fid[a][c] = fcnt++;

         else fc[fcnt] = Face(a, b, c), fid[a][b] = fid[b][c] = fid[c][a] = fcnt++;

     }

     bool dfs(int p, int f) {

         if (!fc[f].ok) return true;

         int a = fc[f].a, b = fc[f].b, c = fc[f].c;

         if (outside(p, a, b, c)) {

             fc[f].ok = false;

             if (!dfs(p, fid[b][a])) addface(p, a, b, c);

             if (!dfs(p, fid[c][b])) addface(p, b, c, a);

             if (!dfs(p, fid[a][c])) addface(p, c, a, b);

             return true;

         }

         return false;

     }

     void build() {

         bool ok;

         fcnt = ;

         sort(pt, pt + pcnt);

         pcnt = unique(pt, pt + pcnt) - pt;

         ok = false;

         for (int i = ; i < pcnt; i++) {

             if (sgn(area(pt[], pt[], pt[i]))) {

                 ok = true;

                 swap(pt[i], pt[]);

                 break;

             }

         }

         if (!ok) return ;

         ok = false;

         for (int i = ; i < pcnt; i++) {

             if (sgn(volume(pt[], pt[], pt[], pt[i]))) {

                 ok = true;

                 swap(pt[i], pt[]);

                 break;

             }

         }

         if (!ok) return ;

         addface(, , , );

         addface(, , , );

         addface(, , , );

         addface(, , , );

         for (int i = ; i < pcnt; i++) {

             for (int j = fcnt - ; j >= ; j--) {

                 if (outside(i, j)) {

                     dfs(i, j);

                     break;

                 }

             }

         }

         int sz = fcnt;

         fcnt = ;

         for (int i = ; i < sz; i++) if (fc[i].ok) fc[fcnt++] = fc[i];

     }

     double facearea() {

         double ret = 0.0;

         for (int i = ; i < fcnt; i++) ret += area(pt[fc[i].a], pt[fc[i].b], pt[fc[i].c]);

         return ret;

     }

     bool same(int i, int j) {

         int a = fc[i].a, b = fc[i].b, c = fc[i].c;

         if (sgn(volume(pt[a], pt[b], pt[c], pt[fc[j].a]))) return false;

         if (sgn(volume(pt[a], pt[b], pt[c], pt[fc[j].b]))) return false;

         if (sgn(volume(pt[a], pt[b], pt[c], pt[fc[j].c]))) return false;

         return true;

     }

     int facecnt() {

         int cnt = ;

         for (int i = ; i < fcnt; i++) {

             bool ok = true;

             for (int j = ; j < i; j++) {

                 if (same(i, j)) {

                     ok = false;

                     break;

                 }

             }

             if (ok) cnt++;

         }

         return cnt;

     }

 } ch;

 int main() {

 //    freopen("in", "r", stdin);

     int n;

     double x, y, z;

     while (~scanf("%d", &ch.pcnt)) {

         for (int i = ; i < ch.pcnt; i++) {

             scanf("%lf%lf%lf", &x, &y, &z);

             ch.pt[i] = Point(x, y, z);

         }

         ch.build();

 //        printf("%.3f\n", ch.facearea());

         printf("%d\n", ch.facecnt());

     }

     return ;

 }