#include<bits/stdc++.h>
using namespace std;

#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define ALL(v) v.begin(),v.end()
typedef long long ll;
template <class T> using V=vector<T>;
template <class T> using VV=V<V<T>>;

ll A[5050][3];
 
int main(){
  ios::sync_with_stdio(false);
  std::cin.tie(nullptr);
  
  VV<ll> dp(5050,V<ll>(3,-1));
  
  int n;
  cin>>n;
  rep(i,n) rep(j,3) cin>>A[i][j];
  
  rep(j,3) dp[max(0,min(5000,(int)A[0][j]-1))][j]=A[0][j];
  for(int i=0;i<n-1;i++){
    VV<ll> old(5050,V<ll>(3,-1));
    rep(j,5001) rep(k,3) rep(l,3){
      if(k==l) continue;
      if(dp[j][k]==-1) continue;
      int tmp=max(0,min(5000,j+(int)A[i+1][l]-1));
      old[tmp][l]=max(old[tmp][l],dp[j][k]+j+A[i+1][l]);
    }
    swap(old,dp);
  }
  ll ans=0;
  rep(j,5001) rep(k,3) ans=max(ans,dp[j][k]);
  cout<<ans<<endl;
    
  return 0;
}