import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        HashMap<Integer, Long> xMap = new HashMap<>();
        HashMap<Integer, Long> yMap = new HashMap<>();
        for (int i = 0; i < n; i++) {
            int type = sc.nextInt();
            int value = sc.nextInt() - sc.nextInt();
            if (type == 0) {
                xMap.put(value, xMap.getOrDefault(value, 0L) + 1);
            } else {
                yMap.put(value, yMap.getOrDefault(value, 0L) + 1);
            }
        }
        long ans = 0;
        for (int x : xMap.keySet()) {
            ans += xMap.get(x) * yMap.getOrDefault(x, 0L);
        }
        System.out.println(ans);
    }
}

class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public String next() throws Exception {
        if (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
}