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#include <cstdio>
#include <iostream>
#include <algorithm>
#include <cstring>
#include <vector>
#include <set>
#include <map>
#include <array>
#include <random>
#include <cmath>
#include <list>
#include <ctime>
#include <sstream>
#include <queue>
#include <climits>
#include <stack>
#include <random>
#include <bitset>
#include <numeric>
#include <cassert>
using namespace std;
typedef vector<int> vi;
typedef pair<int,int> pii;
typedef long long ll;
#define rep(x, b, e) for(int x=(b); x<(e); ++x)
#define trav(a, x) for(auto& a : x)
#define ford(x, b, e) for(int x=((int)(b))-1; x>=(e); --x)
#define all(c) c.begin(),c.end()
#define sz(x) ((int)((x).size()))
#define pb push_back
#define st first
#define nd second
#define mp(x,y) make_pair(x,y)
typedef short int sint;

#define imie(...) " [" << #__VA_ARGS__ ": " << (__VA_ARGS__) << "] "

int main() {
	ios_base::sync_with_stdio(false); cin.tie(0);
	int n;
	scanf("%d", &n);
	map<int, int> cnter[2];
	rep(i, 0, n) {
		int r, w, t;
		scanf("%d %d %d", &r, &w, &t);
		--r;
		++cnter[r][w - t];
	}
	int res = 0;
	trav(elem, cnter[0]) {
		if (cnter[1][elem.st]) {
			res += min(cnter[1][elem.st], elem.nd);
		}
	}
	printf("%d\n", res);
}