/**
 *   @FileName	a.cpp
 *   @Author	kanpurin
 *   @Created	2021.09.11 18:29:30
**/

#include "bits/stdc++.h" 
using namespace std; 
typedef long long ll;

int main() {
    int n;cin >> n;
    unordered_map<int,int> mp;
    vector<int> a(n),b(n),t(n);
    for (int i = 0; i < n; i++) {
        cin >> a[i] >> b[i] >> t[i];
        if (a[i] == 0) mp[b[i]-t[i]]++;
    }
    ll ans = 0;
    for (int i = 0; i < n; i++) {
        if (a[i] == 1) ans += mp[b[i]-t[i]];
    }
    cout << ans << endl;
    return 0;
}