#include <bits/stdc++.h>
using namespace std;
ifstream f("rays.in");
ofstream g("rays.out");
int X,y_,Y_,n,i,nr;
vector<pair<double,double> > V[2];
double x,y,ult;
void solve(int x)
{
    sort(V[x].begin(),V[x].end());
    ult=-(1<<30);
    for(i=0;i<V[x].size();++i)
    if(V[x][i].second>ult) ult=V[x][i].first,++nr;
}
int main()
{
    f>>n;
    for(i=1;i<=n;++i)
    {
        f>>X>>y_>>Y_;
        if(y_>Y_) swap(y_,Y_);
        x=1.0*y_/X;
        y=1.0*Y_/X;
        if(X<0) V[0].push_back(make_pair(-y,-x));
        else V[1].push_back(make_pair(y,x));
    }
    solve(0);
    solve(1);
    g<<nr;
    return 0;
}