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#include <bits/stdc++.h>
 
using namespace std;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef long long LL;
typedef pair<int,int> PI; 
typedef pair<LL,LL> PLL;
typedef unsigned long long ULL;
typedef pair<double,double> PD;
 
#define FOR(x, b, e) for(int x = b; x<= (e); x++)
#define FORD(x, b, e) for(int x = b; x>= (e); x--)
#define REP(x, n) for(int x = 0; x<(n); ++x)
#define ALL(c) (c).begin(), (c).end()
#define SIZE(x) ((int)(x).size())
 
#define PB push_back
#define IN insert
#define ST first
#define ND second
#define INF 2000000011
#define MOD 1000000007

#define MAXS 500010


int main(){

    ios::sync_with_stdio(0);
    cin.tie(0);
    int n;
    cin>>n;

    map<int,int> zb1,zb2;
    REP(i,n){
        int p1,l,r;
        cin>>p1>>l>>r;
       
        if(p1==1)
            zb1[l-r]++;
        else
            zb2[l-r]++; 
    }
    
    int wyn=0;
    for(auto x:zb1)
        wyn+=min(x.ND,zb2[x.ST]);
    
    cout<<wyn<<"\n";

}