#![allow(unused_macros)]
#![allow(dead_code)]
#![allow(unused_imports)]

// # ファイル構成
// - use宣言
// - libモジュール
// - main関数
// - basicモジュール
//
// 常に使うテンプレートライブラリはbasicモジュール内にあります。
// 問題に応じて使うライブラリlibモジュール内にコピペしています。
// ライブラリのコードはこちら → https://github.com/RheoTommy/at_coder
// Twitterはこちら → https://twitter.com/RheoTommy

use std::collections::*;
use std::io::{stdout, BufWriter, Write};

use crate::basic::*;
use crate::lib::*;

pub mod lib {}

fn main() {
    let out = stdout();
    let mut writer = BufWriter::new(out.lock());
    let mut sc = Scanner::new();

    let n = sc.next_usize();
    let a = (0..n).map(|_| sc.next_int()).collect::<Vec<_>>();

    let mut cnt = 0;
    let mut r = 1;
    let mut map = BTreeMap::new();
    *map.entry(a[0]).or_insert(0) += 1;
    *map.entry(a[1]).or_insert(0) += 1;
    for l in 0..n - 1 {
        while {
            let mut iter = map.iter().flat_map(|(k, v)| (0..*v).map(move |_| *k));
            let m1 = iter.next().unwrap();
            let m2 = iter.next().unwrap();
            let m = iter.next_back().unwrap_or(m2);
            // writeln!(writer, "{:?}", (l, r, m1 + m2 >= m && r < n));
            m1 + m2 >= m && r < n
        } {
            r += 1;
            if r < n {
                *map.entry(a[r]).or_insert(0) += 1;
            }
        }
        cnt += r - l - 1;
        *map.entry(a[l]).or_insert(0) -= 1;
        if map[&a[l]] == 0 {
            map.remove(&a[l]);
        }
        // writeln!(writer, "{:?}", (l, r));
    }

    writeln!(writer, "{}", cnt).unwrap();
}

pub mod basic {
    pub const U_INF: u64 = 1 << 60;
    pub const I_INF: i64 = 1 << 60;

    pub struct Scanner {
        buf: std::collections::VecDeque<String>,
        reader: std::io::BufReader<std::io::Stdin>,
    }

    impl Scanner {
        pub fn new() -> Self {
            Self {
                buf: std::collections::VecDeque::new(),
                reader: std::io::BufReader::new(std::io::stdin()),
            }
        }

        fn scan_line(&mut self) {
            use std::io::BufRead;
            let mut flag = 0;
            while self.buf.is_empty() {
                let mut s = String::new();
                self.reader.read_line(&mut s).unwrap();
                let mut iter = s.split_whitespace().peekable();
                if iter.peek().is_none() {
                    if flag >= 5 {
                        panic!("There is no input!");
                    }
                    flag += 1;
                    continue;
                }

                for si in iter {
                    self.buf.push_back(si.to_string());
                }
            }
        }

        pub fn next<T: std::str::FromStr>(&mut self) -> T {
            self.scan_line();
            self.buf
                .pop_front()
                .unwrap()
                .parse()
                .unwrap_or_else(|_| panic!("Couldn't parse!"))
        }

        pub fn next_usize(&mut self) -> usize {
            self.next()
        }

        pub fn next_int(&mut self) -> i64 {
            self.next()
        }

        pub fn next_uint(&mut self) -> u64 {
            self.next()
        }

        pub fn next_chars(&mut self) -> Vec<char> {
            self.next::<String>().chars().collect()
        }

        pub fn next_string(&mut self) -> String {
            self.next()
        }

        pub fn next_char(&mut self) -> char {
            self.next()
        }

        pub fn next_float(&mut self) -> f64 {
            self.next()
        }
    }
}