#include<bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)n;i++)
#define EQ(a,b) (abs((a)-(b)) < EPS)
#define fs first
#define sc second
using namespace std;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef long double D;
typedef complex<D> P;
typedef pair<P,P> L;
typedef vector<P> Poly;

const D EPS = 1e-10L;
const D PI = acos(-1);

namespace std{
  bool operator<(const P &a,const P &b){
    return EQ(real(a),real(b))?imag(a)<imag(b):real(a)<real(b);
  }
  bool operator==(const P &a, const P &b){return EQ(a,b);}
}

inline D dot(P x,P y){return real(conj(x)*y);}
inline D cross(P x,P y){return imag(conj(x)*y);}

inline int ccw(P a,P b,P c){
  b -= a;c -= a;
  if (cross(b,c)>EPS) return 1;   //counter clockwise
  if (cross(b,c)<-EPS) return -1; //clockwise
  if (dot(b, c)<-EPS) return 2;   //c--a--b on line
  if (abs(b)+EPS<abs(c)) return -2;   //a--b--c on line
  return 0;                       //on segment
}

inline bool is_cp(L a,L b){
  if(ccw(a.fs,a.sc,b.fs)*ccw(a.fs,a.sc,b.sc)<=0)
    if(ccw(b.fs,b.sc,a.fs)*ccw(b.fs,b.sc,a.sc)<=0)return true;
  return false;
}

inline P seg_cp(L a,L b){
  double d = abs(cross(b.sc-b.fs,a.fs-b.fs));
  return a.fs + (a.sc-a.fs)*( d /(d + abs(cross(b.sc-b.fs,a.sc-b.fs))) );
}

inline  bool para(L a,L b){return abs(cross(a.fs-a.sc,b.fs-b.sc))<EPS;}

inline bool in_poly(Poly p,P x){
  if(p.empty())return false;

  int s = p.size();
  D xMax = x.real();
  rep(i,s){
    if(xMax < p[i].real())xMax = p[i].real();
    if(EQ(x,p[i]))return false;
  }
  L h = L( x,P(xMax + 1.0, x.imag()) );

  int c = 0;
  rep(i,s){
    L l = L(p[i],p[(i+1)%s]);
    if(!para(h,l) && is_cp(h,l)){
      P cp = seg_cp(h,l);
      if(cp.real() < x.real() + EPS)continue;
      if(!EQ(cp, (l.fs.imag() < l.sc.imag())?l.sc:l.fs))c++;
    }
  }

  return (c&1)?true:false;
}

inline vector<L> seg_set_cut(vector<L> l){
  int card = l.size();
  vector< vector<L> > vl(card);
  rep(i,card)vl[i].push_back(l[i]);
  
  rep(i,card)for(int j=i+1;j<card;j++){
    rep(ii,vl[i].size())rep(jj,vl[j].size()){
      if(is_cp(vl[i][ii],vl[j][jj])){
	P cp = seg_cp(vl[i][ii],vl[j][jj]);
	if(!EQ(vl[i][ii].fs,cp) && !EQ(vl[i][ii].sc,cp)){
	  vl[i].push_back(L(vl[i][ii].sc,cp));
	  vl[i][ii] = L(vl[i][ii].fs,cp);
	}
	if(!EQ(vl[j][jj].fs,cp) && !EQ(vl[j][jj].sc,cp)){
	  vl[j].push_back(L(vl[j][jj].sc,cp));
	  vl[j][jj] = L(vl[j][jj].fs,cp);
	}
	goto END;
      }
    }
  END:;
  }
  vector<L> res;
  rep(i,card){
    rep(j,vl[i].size())res.push_back(vl[i][j]);
  }
  return res;
}

//union-find
vi uf,rank;
void init(int n){
  uf.resize(n); rank.resize(n);
  rep(i,n)uf[i] = i, rank[i] = 0;
}

int find(int a){
  if(uf[a]==a)return a;
  return uf[a] = find(uf[a]);
}

int unite(int a, int b){
  a = find(a); b = find(b);
  if(a==b)return 0;
  if(rank[a]<rank[b])uf[a] = b;
  else{
    uf[b] = a;
    if(rank[a]==rank[b])rank[a]++;
  }
  return 1;
}

int main(){
  int n;
  cin >> n;
  vector<L> seg(n);

  rep(i,n){
    int x,y;
    cin >> x >> y; seg[i].fs = P(x,y);
    cin >> x >> y; seg[i].sc = P(x,y);
  }

  vector<L> SegSet = seg_set_cut(seg);

  vector<P> tmp,p;
  rep(i,SegSet.size()){
    tmp.push_back(SegSet[i].fs);
    tmp.push_back(SegSet[i].sc);
  }
  sort(tmp.begin(),tmp.end());

  rep(i,(int)tmp.size()){
    if(i && EQ(tmp[i],tmp[i-1]))continue;
    p.push_back(tmp[i]);
  }

  vector<pii> l(SegSet.size());
  vector<vi> wall(p.size());
 
  rep(i,SegSet.size()){
    int s=-1,t=-1;
    rep(j,p.size()){
      if(EQ(SegSet[i].fs,p[j]))s = j;
      if(EQ(SegSet[i].sc,p[j]))t = j;
    }
    l[i] = pii(s,t);
    wall[s].push_back(t); wall[t].push_back(s);
  }

  rep(i,p.size()){
    for(int j=0;j<(int)wall[i].size();j++){
      D s1 = arg(p[wall[i][j]]-p[i]);
      for(int k=j+1;k<(int)wall[i].size();k++){
	D s2 = arg(p[wall[i][k]]-p[i]);
	if(s1>s2)swap(wall[i][j],wall[i][k]), s1 = s2;
      }
    }
  }

  vector<vi> g(l.size(),vi(2,-1));
  vector<Poly> PolySet;
  vi id;

  rep(i,l.size()){
    rep(j,2){
      int cur = i, dir = j;
      if(g[cur][dir]>=0)continue;

      D area = 0;
      Poly poly;
      while(true){
	g[cur][dir] = id.size();
	poly.push_back(dir?p[l[cur].fs]:p[l[cur].sc]);

	int node = dir?l[cur].fs:l[cur].sc;
	int prv = dir?l[cur].sc:l[cur].fs;
	rep(k,wall[node].size()){
	  if(wall[node][k] == prv){
	    int nxt = wall[node][(k+1)%wall[node].size()];
	    area += cross(p[node],p[prv]);
	    prv = node;
	    node = nxt;
	    break;
	  }
	}
	
	rep(k,l.size()){
	  if(prv == l[k].fs && node == l[k].sc){
	    cur = k; dir = 0; break;
	  }
	  if(prv == l[k].sc && node == l[k].fs){
	    cur = k; dir = 1;  break;
	  }
	}
	if(g[cur][dir]>=0)break;
      }
      if(area>EPS){
	id.push_back(PolySet.size());
	PolySet.push_back(poly);
      }else{
	id.push_back(-1);
      }
    }
  }

  int ans = PolySet.size();
  init(PolySet.size());

  rep(i,PolySet.size()){
    rep(j,PolySet.size()){
      if(i==j)continue;
      bool f = true;
      rep(k,PolySet[i].size()){
	f &= in_poly(PolySet[j],PolySet[i][k]);
	if(!f)break;
      }
      if(f)ans -= unite(i,j);
    }
  }

  rep(i,l.size()){
    int a = id[g[i][0]], b = id[g[i][1]];
    if(a<0 || b<0)continue;
    ans -= unite(a,b);
  }

  cout << ans << endl;
}

Measured memory_bytes: 1556