#include <bits/stdc++.h>
#define all(a) (a).begin(), (a).end()
#define Z string::npos
using namespace std;
using namespace chrono;
signed main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int n; cin >> n;
set<tuple<int,int,int>> s;
for (int i = 0; i < n; i++) {
int x,y,z; cin >> x >> y >> z;
s.emplace(x, y, z);
}
int ans = -1;
for (auto [xi, yi, zi] : s) {
for (auto [xj, yj, zj] : s) {
for (auto [xk, yk, zk] : s) {
if (xi > max(xj, xk) &&
yj > max(yi, yk) &&
zk > max(zi, zj)) {
ans = max(ans, xi + yj + zk);
}
}
}
}
cout << ans;
}
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