#include<bits/stdc++.h>
#define ll long long
#define co cout<<
// TLE 2 sec
using namespace std;
// stuff
void solve(){
ll n;
cin>>n;
ll arr[n+5][3];
if(n>500) return;
ll mx=-1;
for(int i=0;i<n;i++) cin>>arr[i][0]>>arr[i][1]>>arr[i][2];
for(int i=0;i<n;i++){
for(int j=0;j<n;j++){
for(int k=0;k<n;k++){
if(arr[i][0]>max(arr[j][0],arr[k][0])&&arr[j][1]>max(arr[i][1],arr[k][1])&&arr[k][2]>max(arr[i][2],arr[j][2])){
mx=max(mx,arr[i][0]+arr[j][1]+arr[k][2]);
}
}
}
}
co mx;
}
int main(){
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
int _=1;
// cin>>_;
while(_--) solve();
}
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