#include <bits/stdc++.h>
#define MAX 1000001
#define INF 1000000000000000000
#define M 1000000007
#define ll long long
#define zero(x) memset(x,0,sizeof(x))
using namespace std;
 
map<double,ll> mp;
vector<double> v;
vector<ll> use;
int tot;
 
ll dp[MAX][4];
 
int main(){
	int n;
	cin >> n;
	tot = 0;
	for (int i=0;i<n;i++){
		double waste,num,den;
		cin >> num >> den >> waste;
		double sl;
		if (!den) sl = INF;
		else sl = num/den;
		if (!mp[sl]){
			v.push_back(sl);
			tot++;
		}
		mp[sl]++;
	}
	for (int i=0;i<tot;i++) use.push_back(mp[v[i]]);
	if (tot<3){
		cout << 0;
		return 0;
	}
 
	for(int i=0;i<3;i++) dp[tot][i] = 1;
	for(int i=0;i<=tot;i++) dp[i][3] = 1;
	for (int i=tot-1;i>=0;i--){
		for (int j=2;j>=0;j--){
			if (i==(tot-(3-j))) dp[i][j] = use[i]*dp[i+1][j+1];
			else dp[i][j] = dp[i+1][j]+dp[i+1][j+1]*use[i];
		}
	}
	cout << dp[0][0];
	return 0;
}

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NQotNSAzIDAKLTUgLTMgLTMwCjAgMSAwCjMgNyAzNQoxIC0yIC0x

5
-5 3 0
-5 -3 -30
0 1 0
3 7 35
1 -2 -1