This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define ll long long
int main() {
	ios_base::sync_with_stdio(0), cin.tie(0);
	int n;
	cin >> n;
	array<int, 3> a[n];
	for (int i = 0; i < n; i++) {
		cin >> a[i][0] >> a[i][1] >> a[i][2];
	}
	int ans = -1;
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < n; j++) {
			for (int k = 0; k < n; k++) {
				if (a[i][0] > a[j][0] && a[i][0] > a[k][0] && 
					a[j][1] > a[i][1] && a[j][1] > a[k][1] && 
					a[k][2] > a[i][2] && a[k][2] > a[j][2]) {
					ans = max(ans, a[i][0] + a[j][1] + a[k][2]);
				}
			}
		}
	}
	cout << ans << '\n';
	return 0;
}
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