struct Point
{double x,y,z;Point() {}Point(double _x,double _y,double _z){x=_x;y=_y;z=_z;}void Get(){RD(x,y,z);}Point operator-(const Point p1){return Point(x-p1.x,y-p1.y,z-p1.z);}Point operator*(Point p){return Point(y*p.z-z*p.y,z*p.x-x*p.z,x*p.y-y*p.x);}double operator^(Point p){return x*p.x+y*p.y+z*p.z;}double len(){return sqrt(sqr(x)+sqr(y)+sqr(z));}
};struct _3DCH
{struct face{int a,b,c,ok;face(){}face(int _a,int _b,int _c,int _ok){a=_a;b=_b;c=_c;ok=_ok;}}F[N<<2];int n,cnt,b[N][N];Point p[N];int DB(double x){if(x>1e-10) return 1;if(x<-1e-10) return -1;return 0;}double vlen(Point a){return a.len();}double getArea(Point a,Point b,Point c){return vlen((b-a)*(c-a));}double getVolume(Point a,Point b,Point c,Point d){return (b-a)*(c-a)^(d-a);}//t在f的正面返回1，反面返回-1，在f上返回0int getDir(Point t,face f){double x=(p[f.b]-p[f.a])*(p[f.c]-p[f.a])^(t-p[f.a]);return DB(x);}void deal(int i,int x,int y){int f=b[x][y];face temp;if(!F[f].ok) return;if(getDir(p[i],F[f])>0) DFS(i,f);else{temp=face(y,x,i,1);b[y][x]=b[x][i]=b[i][y]=cnt;F[cnt++]=temp;}}void DFS(int i,int j){F[j].ok=0;deal(i,F[j].b,F[j].a);deal(i,F[j].c,F[j].b);deal(i,F[j].a,F[j].c);}void construct(){if(n<4) return;int i,j,k=0;FOR1(i,n-1) if(DB(vlen(p[0]-p[i]))){swap(p[1],p[i]);k=1;break;}if(!k) return;k=0;FOR(i,2,n-1) if(DB(getArea(p[0],p[1],p[i]))){swap(p[2],p[i]);k=1;break;}if(!k) return;;k=0;FOR(i,3,n-1) if(DB(getVolume(p[0],p[1],p[2],p[i]))){swap(p[3],p[i]);k=1;break;}if(!k) return;cnt=0;face temp;FOR0(i,4){temp=face((i+1)%4,(i+2)%4,(i+3)%4,1);if(getDir(p[i],temp)>0) swap(temp.b,temp.c);b[temp.a][temp.b]=b[temp.b][temp.c]=b[temp.c][temp.a]=cnt;F[cnt++]=temp;}FOR(i,4,n-1) FOR0(j,cnt) if(F[j].ok&&getDir(p[i],F[j])>0){DFS(i,j);break;}j=0;FOR0(i,cnt) if(F[i].ok) F[j++]=F[i];cnt=j;}double getSumArea(){double ans=0;int i;FOR0(i,cnt) ans+=getArea(p[F[i].a],p[F[i].b],p[F[i].c]);return ans/2;}int isSame(face a,face b){Point x1=p[a.a],y1=p[a.b],z1=p[a.c];Point x2=p[b.a],y2=p[b.b],z2=p[b.c];if(DB(getVolume(x1,y1,z1,x2))) return 0;if(DB(getVolume(x1,y1,z1,y2))) return 0;if(DB(getVolume(x1,y1,z1,z2))) return 0;return 1;}int getFactNum(){int ans=0,i,j;FOR0(i,cnt){FOR(j,i+1,cnt-1) if(isSame(F[i],F[j])){break;}ans+=j>=cnt;}return ans;}
};_3DCH a;int main()
{while(scanf("%d",&a.n)!=-1){int i;FOR0(i,a.n) a.p[i].Get();a.construct();int s=a.getFactNum();printf("%d\n",s);}return 0;
}