#include <bits/stdc++.h>
using namespace std;
typedef signed long long ll;

#define _P(...) (void)printf(__VA_ARGS__)
#define FOR(x,to) for(x=0;x<(to);x++)
#define FORR(x,arr) for(auto& x:arr)
#define FORR2(x,y,arr) for(auto& [x,y]:arr)
#define ALL(a) (a.begin()),(a.end())
#define ZERO(a) memset(a,0,sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
template<class T> bool chmax(T &a, const T &b) { if(a<b){a=b;return 1;}return 0;}
template<class T> bool chmin(T &a, const T &b) { if(a>b){a=b;return 1;}return 0;}
//-------------------------------------------------------

int Q;
set<int> V;
set<pair<int,int>> E;
set<pair<ll,int>> F;

void solve() {
	int i,j,k,l,r,x,y; string s;
	
	cin>>Q;
	while(Q--) {
		ll a,b,c;
		cin>>a>>b>>c;
		V.insert(a);
		V.insert(b);
		V.insert(c);
		E.insert({a,b});
		E.insert({b,c});
		E.insert({a,c});
		F.insert({a*1000000000+b,c});
	}
	cout<<(int)V.size()+(int)F.size()-(int)E.size()<<endl;
}


int main(int argc,char** argv){
	string s;int i;
	if(argc==1) ios::sync_with_stdio(false), cin.tie(0);
	FOR(i,argc-1) s+=argv[i+1],s+='\n'; FOR(i,s.size()) ungetc(s[s.size()-1-i],stdin);
	cout.tie(0); solve(); return 0;
}