#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef tuple<int,int,int> trio;
const int MAXN = 5e5+5;
const ll MOD = 1e9+7;
#define all(x) x.begin(), x.end()
#define sz(x) (int)x.size()
#define mk make_pair
#define pb push_back
#define fr first
#define sc second
#define X get<0>
#define Y get<1>
#define Z get<2>
int n;
set<trio> x, y, z;
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
cin >> n;
for(int i = 1, a, b, c; i <= n; i++) {
cin >> a >> b >> c;
x.insert({a,b,c});
y.insert({b,c,a});
z.insert({c,a,b});
}
int ans = -1;
while(!x.empty()) {
trio mx = *x.rbegin(), my = *y.rbegin(), mz = *z.rbegin();
if(Y(mx) == X(my) or Z(mx) == X(mz)) {
x.erase({X(mx), Y(mx), Z(mx)});
y.erase({Y(mx), Z(mx), X(mx)});
z.erase({Z(mx), X(mx), Y(mx)});
continue;
}
if(Y(my) ==X(mz)) {
y.erase({X(my), Y(my), Z(my)});
z.erase({Y(my), Z(my), X(my)});
x.erase({Z(my), X(my), Y(my)});
continue;
}
ans = X(mx) + X(my) + X(mz);
break;
}
cout << ans << "\n";
}
