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///MEMENTO MEMO, MEMENTO LONG LONG
#include <bits/stdc++.h>

#define DEBUG if(0)
#define COUT cout << "\e[36m"
#define ENDL "\e[39m" << endl
#define VAR(v) " [\e[32m" << #v << "\e[36m=\e[91m" << v << "\e[36m] "

using namespace std;

typedef long long LL;
const int MAXINT = 1e6;
int n;
struct Car
{
    int type, pos, time;
    int accId()
    {
        return time - pos;
    }
};
vector<Car> cars;


int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    cin >> n;
    vector<array<int,2>> cnt;
    cars.resize(n);
    int minAccId = MAXINT, maxAccId = -MAXINT;
    for (int i = 0; i < n; ++i) {
        cin >> cars[i].type >> cars[i].pos >> cars[i].time;
        minAccId = min(minAccId, cars[i].accId());
        maxAccId = max(maxAccId, cars[i].accId());
    }
    DEBUG COUT << VAR(minAccId) << ENDL;
    for(auto& el : cars)
    {
        el.time -= minAccId;
    }
    maxAccId -= minAccId;
    maxAccId++;
    cnt.resize(maxAccId);
    for(auto car : cars)
    {
        cnt[car.accId()][car.type-1]++;
    }
    int ans = 0;
    for(auto el : cnt)
    {
        ans += min(el[0], el[1]);
    }
    cout << ans << "\n";

    return 0;
}