#include <bits/stdc++.h>

using namespace std;
const int SIZE = 5e5 + 2;
long long l[SIZE], r[SIZE], v[SIZE];
long long pref[SIZE], suf[SIZE];
int main()  {
  ios_base::sync_with_stdio(0);
  int n;
  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> l[i] >> r[i] >> v[i];
  }
  pref[0] = v[0];
  for (int i = 1; i < n; i++) {
    pref[i] = min(pref[i - 1], l[i]) + v[i];
  }
  suf[n - 1] = v[n - 1];
  for (int i = n -  2; i >= 0; i--) {
    suf[i] = min(suf[i + 1], r[i]) + v[i];
  }
  long long mx = -1e9;
  for (int i = 0; i < n; i++) {
    mx = max(mx, pref[i] + suf[i] - v[i]);
  }
  cout << mx;



  return 0;
}