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

int n, r, w, t;

int type1[2000002];
int type2[2000002];

int main()
{
    cin >> n;

    for(int i = 0; i < n; i++)
    {
        cin >> r >> w >> t;
        w -= t;
        if(r==1)
            type1[w+1000000]++;
        else
            type2[w+1000000]++;
    }

    int result = 0;
    for(int i = 0; i <= 2000000; i++)
    {
        if(type1[i] > 0 && type2[i] > 0)
            result += (min(type1[i], type2[i]));
    }

    cout << result;
    return 0;
}