#include <bits/stdc++.h>
#include <atcoder/all>
using mint = atcoder::static_modint<998244353>;
//using mint = atcoder::static_modint<1000000007>;
using namespace std;
using namespace atcoder;
using ld = long double;
using ll = long long;
#define mp(a,b) make_pair(a,b)
#define rep(i,s,n) for(int i=s; i<n; i++)
const vector<int> dx{1,0,-1,0},dy{0,1,0,-1};

int main(){
    int n;cin >> n;
    vector<vector<int>> a(n+1,vector<int>(3));
    rep(i,1,n+1)rep(j,0,3)cin >> a[i][j];

    vector<vector<pair<ll,ll>>> dp(n+1,vector<pair<ll,ll>>(3));

    rep(i,1,n+1)rep(j,0,3)rep(k,0,3)if(j!=k){
        int atk=dp[i-1][j].first+a[i][k];
        pair<ll,ll> p=mp(max(0,atk-1),dp[i-1][j].second+atk);
        
        auto [x,y]=dp[i][k];
        ll val_k=y+(n-i)*(2*x-n+i+1)/2;
        ll val_p=p.second+(n-i)*(2*p.first-n+i+1)/2;
        if(val_p>val_k)dp[i][k]=p;
    }
    ll ans=0;
    rep(i,0,3)ans=max(ans,dp[n][i].second);
    cout <<ans;
}