#include <bits/stdc++.h>
#define va first
#define vb second
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
int N;
ll X[3030], Y[3030], C[3030];
int main() {
cin.tie(0); ios_base::sync_with_stdio(0);
cin >> N;
for (int i=0; i<N; i++) {
cin >> X[i] >> Y[i] >> C[i];
}
ll ans = 0;
for (int i=0; i<N; i++) {
for (int j=i+1; j<N; j++) {
int cnt[3][2]; memset(cnt, 0, sizeof cnt);
for (int k=0; k<N; k++) {
ll t = (X[k]-X[i])*(Y[j]-Y[i]) - (X[j]-X[i])*(Y[k]-Y[i]);
if (t == 0) continue;
t = t>0 ? 0 : 1;
cnt[C[k]][t]++;
}
ll li=1, lj=1, ri=1, rj=1;
for (int k=0; k<3; k++) {
if (C[i] != k) li *= cnt[k][0], ri *= cnt[k][1];
if (C[j] != k) lj *= cnt[k][0], rj *= cnt[k][1];
}
ans += li*rj + lj*ri;
}
}
cout << ans/2;
}
