#pragma GCC diagnostic warning "-Wextra"
#pragma GCC diagnostic warning "-Wshadow"
#include <bits/stdc++.h>
using namespace std;

template <class A, class B> bool cmin(A& a, B b) { return a > b && (a = b, true); }
template <class A, class B> bool cmax(A& a, B b) { return a < b && (a = b, true); }
template <class A, class B> ostream& operator<<(ostream& os, pair<A, B>& p) { return os << '(' << p.first << ", " << p.second << ')'; }
static bool debug = false;
void dump() {}
template <class A, class... B> void dump(A&& a, B&&... b) { if (debug) cout << a << (sizeof...(b) ? ' ' : '\n'), dump(b...); }
template <class A> void dump1D(A& a) { if (debug) for (auto i = a.begin(); i != a.end(); i++) cout << *i << (next(i) != a.end() ? ' ' : '\n'); }
template <class A> void dump2D(A& a) { if (debug) for (auto i = a.begin(); i != a.end(); i++) dump1D(*i), cout << (next(i) != a.end() ? "" : "\n"); }

signed main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  // debug = true;

  int N;
  cin >> N;
  vector<int> A(N);
  for (int i = 0; i < N; i++) cin >> A.at(i);

  multiset<int> MS;
  auto f = [&]() {
    if ((int)MS.size() < 2) return false;
    return *prev(MS.end()) > *MS.begin() + *next(MS.begin());
  };

  long ans = 0;
  for (int l = 0, r = 0; r < N; r++) {
    MS.insert(A.at(r));
    while (f()) MS.erase(MS.find(A.at(l++)));
    dump(make_pair("l", l), make_pair("r", r));
    ans += r - l;
  }
  cout << ans << '\n';
}