//#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
#include <iostream>
#include <algorithm>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using mint = modint1000000007;
using ll = long long;
using pii = pair<int,int>;
using pll = pair<ll,ll>;
using vi = vector<int>;  using vvi = vector<vi>;
using vl = vector<ll>;   using vvl = vector<vl>;
using vb = vector<bool>; using vvb = vector<vb>;
using vm = vector<mint>; using vvm = vector<vm>;
using vpi = vector<pii>; using vvpi = vector<vpi>;
using vpl = vector<pll>; using vvpl = vector<vpl>;
const int inf = 1 << 30;
const ll INF = 1LL << 60;
#define rep(i,m,n) for (int i = m; i < (int)(n); i++)
#define rrep(i,m,n) for (int i = m; i > (int)(n); i--)

int main(){
    int n; cin >> n;
    vl A(4e5+10),B(4e5+10);
    rep(i,0,n){
        int a,b,t; cin >> a >> b >> t;
        if (a == 1){
            A[t-b+2e5]++;
        }
        if (a == 0){
            B[t-b+2e5]++;
        }
    }
    ll ans = 0;
    rep(i,0,4e5+10){
        ans += A[i]*B[i];
    }
    cout << ans << endl;
}