#include <bits/stdc++.h>
#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL)
#define debug(x) cout << "Line " << __LINE__ << ", " << #x << " is " << x << endl
#define all(x) x.begin(), x.end()
#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define ll long long
#define ull unsigned long long
#define pll pair<ll, ll>
#define pii pair<ll, ll>
#define ld long double
#define nl '\n'
#define tb '\t'
#define sp ' '
#define sqr(x) (x)*(x)
#define arr3 array<ll, 3>
using namespace std;
const ll MX=150002, MOD=1000000007, BLOCK=160, INF=1e9+7, LG=62;
const ll INFF=1000000000000000004;
const ld ERR=1e-6, pi=3.14159265358979323846;
ll N, X[MX], Y[MX], Z[MX];
pll A[MX], B[MX], C[MX];
int main(){
fastio;
cin >> N;
for(ll i=0; i<N; i++){
cin >> X[i] >> Y[i] >> Z[i];
A[i]={X[i], i};
B[i]={Y[i], i};
C[i]={Z[i], i};
}
sort(A, A+N);
sort(B, B+N);
sort(C, C+N);
ll px=N-1, py=N-1, pz=N-1;
while(px>=0 && py>=0 && pz>=0){
ll x=A[px].se, y=B[py].se, z=C[pz].se;
if(X[x]<=X[y]){py--; continue;}
if(X[x]<=X[z]){pz--; continue;}
if(Y[y]<=Y[x]){px--; continue;}
if(Y[y]<=Y[z]){pz--; continue;}
if(Z[z]<=Z[x]){px--; continue;}
if(Z[z]<=Z[y]){py--; continue;}
cout << X[x]+Y[y]+Z[z] << nl;
return 0;
}
cout << "-1\n";
}
