#include<iostream>
#include<cmath>
#include<cstdio>
#include<algorithm>
#include<vector>
#include<set>
#include<cassert>//1回カウントした交点を2度カウントしない要潤
#define EPS 1e-10
#define F first
#define S second
#define COUNTER_CLOCKWISE 1
#define CLOCKWISE -1
#define ONLINE_BACK 2
#define ONLINE_FRONT -2
#define ON_SEGMENT 0
using namespace std;
struct P{
  double x,y;
  P(double x=0,double y=0):x(x),y(y){}
  P operator + (P p){return P(x+p.x,y+p.y);}
  P operator - (P p){return P(x-p.x,y-p.y);}
  P operator * (P p){return P(x*p.x,y*p.y);}
  P operator / (P p){return P(x/p.x,y/p.y);}

  bool operator == (const P &p) const{
    return (fabs(x-p.x) < EPS && fabs(y-p.y) < EPS);
  }

  bool operator < (const P &p) const{
    return x!=p.x?fabs(x-p.x)<EPS:fabs(y-p.y)<EPS;
  }

};

typedef pair<P,P> Segment;

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

double cross(P a,P b){
  return a.x*b.y-a.y*b.x;
}

double norm(P p){
  return p.x*p.x+p.y*p.y;
}

double abs(P p){
  return sqrt(norm(p));
}

int ccw(P p,P q,P r){
  P a = q-p;
  P b = r-p;
  if(cross(a,b) > EPS)return COUNTER_CLOCKWISE;
  if(cross(a,b) < -EPS)return CLOCKWISE;
  if(dot(a,b) < -EPS)return ONLINE_BACK;
  if(norm(a) < norm(b))return ONLINE_FRONT;
  return ON_SEGMENT;
}

bool isIntersect(P p1,P p2,P p3,P p4){
  return (ccw(p1,p2,p3)*ccw(p1,p2,p4) <= 0 && ccw(p3,p4,p1)*ccw(p3,p4,p2) <= 0);
}


P crosspoint(P p1,P p2,P p3,P p4) {
  double A = cross(p2 - p1, p4 - p3);
  double B = cross(p2 - p1, p2 - p3);
  //if (abs(A) < EPS && abs(B) < EPS) return p3; 
  //if (abs(A) < EPS) assert(false); 
  P pro = p4-p3;
  pro.x = pro.x*(B/A);
  pro.y = pro.y*(B/A);
  return p3 + pro;
}


/*
P crosspoint(P a1, P a2, P b1, P b2) {
  P a = a2 - a1;
  P b = b2 - b1;
  return a1 + a * cross(b, b1 - a1)/cross(b, a);
}
*/

int main(){
  int n,xx,yy,xxx,yyy,field;
  vector<Segment> pos;
  Segment pesh;//真夜中の要潤
  vector<P> exist;
  
  P xp; //x(corss)point

  while(cin >> n && n){
    field = 1;
    pos.clear();
    for(int i=0;i<n;i++){
      cin >> xx >> yy >> xxx >> yyy;
      pesh.F.x = xx;pesh.F.y = yy;
      pesh.S.x = xxx;pesh.S.y = yyy;
      pos.push_back(pesh);
  
      int x_counter=0;
      bool new_x = true;
      exist.clear();
      for(int i=0;i<pos.size()-1;i++){
	new_x=true;// <- ずっとここで初期化すること忘れてたゾ☆
	if(isIntersect(pos[i].F,pos[i].S,pos[pos.size()-1].F,pos[pos.size()-1].S)){
	  xp = crosspoint(pos[i].F,pos[i].S,pos[pos.size()-1].F,pos[pos.size()-1].S);
	  //cout << "xp = " << xp.x << "," << xp.y << endl;

	  if(100-fabs(xp.x) < EPS || 100-fabs(xp.y) < EPS)continue;	 
	
	  for(int j=0;j<exist.size();j++){
	    //if(abs(exist[j]-xp)<EPS ){
	    if(exist[j]==xp){
	      new_x = false;
	      break;
	    }
	  }
	  if(new_x){
	    x_counter++;
	    exist.push_back(xp);
	  }
	}
      }
      //x_counter = ex.size();
      field += x_counter+1;
    }
   
    cout << field << endl;


  }
  return 0;
}




	  //cout <<"here" << endl;



 //cout << "xp = " << xp.x << "," << xp.y << endl;

  //cout <<"x_counter = " << x_counter <<  ",field = " << field << endl;

	//cout << "pos[now] = " << pos[pos.size()-1].F.x << "," << pos[pos.size()-1].F.y <<" - " << pos[pos.size()-1].S.x << "," << pos[pos.size()-1].S.y  <<"/ pos[" << i << "] = " << pos[i].F.x << "," << pos[i].F.y  << " - " << pos[i].S.x << "," << pos[i].S.y<< endl; 






































































//そう、ここは要潤






































































//もう。。。。。要潤

Measured memory_bytes: 1208