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#include <bits/stdc++.h>

#define FOR(i, a, b) for(int i = a; i<b; ++i)
#define FR(a, b) for(int i = a; i>=b;--i)
#define _fastio cin.tie(0); ios_base::sync_with_stdio(0)
#define pb push_back
#define mp make_pair
#define INF 1e13

using namespace std;

typedef long long ll;
typedef double db;
typedef unsigned long long ull;
typedef pair<int, int> iPair;

const int MAX = 5e5 + 2;
const int M = 1e9 +7;

int n, res;
map<int, int> a, b;
int main()
{
    _fastio;
    cin>>n;
    FOR(i, 0, n)
    {
        int x, y, z;
        cin>>x>>y>>z;
        if(x == 1)
            a[y-z]++;
        else
            b[y-z]++;
    }
    for(auto x : a)
        res += min(x.second, b[x.first]);
    cout<<res<<"\n";
}