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#include <bits/stdc++.h>
using namespace std;

int horizontal[2000006];
int vertical[2000006];
int MAX=1000001;

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int result=0,n;
    cin >> n;
    for(int i=0;i<n;i++){
        int r,w,t;
        cin >> r >> w >> t;
        if(r==1){
            if(vertical[w-t+MAX]<horizontal[w-t+MAX])result++;
            vertical[w-t+MAX]++;
        }
        else{
            if(horizontal[w-t+MAX]<vertical[w-t+MAX])result++;
            horizontal[w-t+MAX]++;
        }
    }
    cout << result << "\n";

    return 0;
}