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#include <bits/stdc++.h>
 
#define f first
#define s second
#define pb push_back
#define mp make_pair
 
#define ins insert
#define er erase
 
#define siz size()
#define siz1 size()-1
 
#define ll long long
#define ull unsigned long long
#define all(v) v.begin(), v.end()
 
#define FORN(i, n) for(int i=1; i<=(int)n; i++)
#define FOR(i,p,k) for(int i=(int)p; i<=(int)k; i++)
#define FORD(i, k, p) for(int i=(int)k; i>=(int)p; i--)
#define FOR0(i, n) for(int i=(int)n; i>=0; i--)
#define FOR1(i, n) for(int i=(int)n; i>=1; i--)
#define FORV(i, vec) for(auto i = vec.begin(); i != vec.end(); ++i)

#define TURBO ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define END cerr<<"TIME: "<<1.0 * clock() / CLOCKS_PER_SEC<<endl;
#define VI vector <int>
#define VP vector <pair<int, int>>
#define VIP vector <pair<int, pair<int, int>>>
#define VPP vector <pair<pair<int, int>, pair<int, int>>>
 
#define MII map<int, int>
#define MLL map<ll, ll>
 
#define PII pair<int, int>
#define PLL pair<ll, ll>
 
#define MAX 1e9 + 10
#define MIN -1e9 + 10

using namespace std;


int main()
{
	TURBO;

	int n;
	cin>>n;
	MII map_type1, map_type2;
	
	int r, w, t;
	for(int i=1; i<=n; i++)
	{
		cin>>r>>w>>t;
		
		if(r==1)
			map_type1[w-t]++;
		else
			map_type2[w-t]++;
	}

	int result = 0;
	int diff, count1, count2;

	for (auto it = map_type1.begin(); it != map_type1.end(); ++it) 
	{ 
		diff = it->f;
		count1 = it->s;
		count2 = map_type2[diff];
		result += min(count1, count2);
    } 
	
	cout<<result;
	return 0;
}