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#include <bits/stdc++.h>
using namespace std;
#define mk make_pair
#define fi first
#define sz(x) x.size()
#define se second
#define pb push_back
#define VAR(v) #v << " = " << v << " "
#define debug if(0)
#define M_PI 3.14159265358979323846
typedef complex<long double> C;
typedef long long ll;
typedef pair<int, int> ii;
typedef vector<ll> Matrix;
const int maxn = (int)1e6 + 9;
const int INF = (int)1e9 + 7;
int mod = (int)1e9 + 7;
int n;
int tab[2*maxn][2];

int main(int argc, char* argv[])
{
    ios::sync_with_stdio(false);
    debug; else cin.tie(NULL), cout.tie(NULL);
    cin>>n;
    for(int i = 0; i < n; i++)
    {
        int r, w, t;
        cin>>r>>w>>t;
        tab[w - t + maxn][r-1]++;
    }
    int ans = 0;
    for(int i = 0; i < 2*maxn; i++)
        ans += max(tab[i][0], tab[i][1]);
    cout<<n - ans<<"\n";
    return 0;
}