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#include <bits/stdc++.h>
using namespace std;
#define fastIO ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define fi first
#define se second
#define repeat(i, x) for (int i = 0; i < (x); ++i)
using pi = pair<int, int>;

int32_t main()
{
    fastIO;

    int n;
    cin >> n;
    
    int r, w, t;
    
    map<int, pi> m;
    
    int ans = 0;
    
    repeat(i, n)
    {
    	cin >> r >> w >> t;
    	if (r == 1)
    		++m[w - t].fi;
    	else
    		++m[w - t].se;
    }
    
    for (auto [x, y] : m)
    	ans += min(y.fi, y.se);
    	
    cout << ans;
    
    return 0;
}