#include <stdio.h>
#include <bits/stdc++.h>
 
using namespace std;
 
class Vacation {
  public:
    int happiness(vector<vector<int>>& tasks, int n, int t) {
      if(n == 0) return 0;
 
      vector<vector<int>> dp(n, vector<int>(t, 0));
 
      for(int i = 0; i < t; ++i) {
        dp[0][i] = tasks[0][i];
      }
 
      for(int i = 1; i < n; ++i) {
        for(int j = 0; j < t; ++j) {
          dp[i][j] = tasks[i][j] + maxHappiness(dp[i-1], j);
        }
      }
      return maxHappiness(dp[n-1], -1);
    }
 
  private:
    int maxHappiness(vector<int>& happiness, int exclude_day) {
      int res = -1;
      for(int i = 0; i < happiness.size(); ++i) {
        if(i == exclude_day) continue;
        res = max(res, happiness[i]);
      }
      return res;
    }
};
 
 
int main() {
  int n; cin >> n;
  int t = 3;
  vector<vector<int>> tasks(n, vector<int>(t));
 
  for(int i = 0; i < n; ++i) {
    for(int j = 0; j < t; ++j) {
      cin >> tasks[i][j];
    }
  }
 
  Vacation* obj  = new Vacation();
  cout << obj->happiness(tasks, n, t) << endl;
  return 0;
}

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