#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
#define FOR(i,m,n) for(int i=(m);i<(n);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
using ll = long long;
constexpr int INF = 0x3f3f3f3f;
constexpr long long LINF = 0x3f3f3f3f3f3f3f3fLL;
constexpr double EPS = 1e-8;
constexpr int MOD = 1000000007;
// constexpr int MOD = 998244353;
constexpr int dy[] = {1, 0, -1, 0}, dx[] = {0, -1, 0, 1};
constexpr int dy8[] = {1, 1, 0, -1, -1, -1, 0, 1}, dx8[] = {0, -1, -1, -1, 0, 1, 1, 1};
template <typename T, typename U> inline bool chmax(T &a, U b) { return a < b ? (a = b, true) : false; }
template <typename T, typename U> inline bool chmin(T &a, U b) { return a > b ? (a = b, true) : false; }
struct IOSetup {
  IOSetup() {
    std::cin.tie(nullptr);
    std::ios_base::sync_with_stdio(false);
    std::cout << fixed << setprecision(20);
  }
} iosetup;

template <typename T = char, typename U = std::string>
std::vector<std::pair<T, int>> run_length_encoding(const U &s) {
  int n = s.size();
  std::vector<std::pair<T, int>> res;
  T now = s[0];
  int cnt = 1;
  for (int i = 1; i < n; ++i) {
    if (s[i] != now) {
      res.emplace_back(now, cnt);
      cnt = 0;
    }
    now = s[i];
    ++cnt;
  }
  res.emplace_back(now, cnt);
  return res;
}

int main() {
  int n; cin >> n;
  vector<int> a(n); REP(i, n) cin >> a[i];
  ll ans = n * (n + 1LL) / 2;
  for (auto [ai, len] : run_length_encoding<int>(a)) {
    if (ai == 1) ans -= len * (len + 1LL) / 2;
  }
  cout << ans << '\n';
  return 0;
}