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#include <iostream>
#include <vector>

using namespace std;
const int offset = 1000010;

int main(){
    std::ios::sync_with_stdio(false);
    cin.tie(0);

    vector<int> X,Y;

    int n;

    cin>>n;
    X.resize(offset*2+1);
    Y.resize(offset*2+1);

    while (n-->0){
        int r,w,t;
        cin>>r>>w>>t;
        if (r==1)
            X[t-w+offset]++;
        else
            Y[t-w+offset]++;
    }

    int counter=0;
    for (size_t i=0; i<X.size(); i++ ){
        counter += min( X[i],Y[i] );
    }
    cout<<counter<<endl;
}