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#include <bits/stdc++.h>

using namespace std;

#define sim template < class c
#define ris return * this
#define dor > debug & operator <<
#define eni(x) sim > typename \
enable_if<sizeof dud<c>(0) x 1, debug&>::type operator<<(c i) {
sim > struct rge { c b, e; };
sim > rge<c> range(c i, c j) { return {i, j}; }
sim > auto dud(c* x) -> decltype(cerr << *x, 0);
sim > char dud(...);
struct debug {
#ifdef LOCAL
~debug() { cerr << endl; }
eni(!=) cerr << boolalpha << i; ris; }
eni(==) ris << range(begin(i), end(i)); }
sim, class b dor(pair < b, c > d) {
  ris << "(" << d.first << ", " << d.second << ")";
}
sim dor(rge<c> d) {
  *this << "[";
  for (c it = d.b; it != d.e; ++it)
    *this << ", " + 2 * (it == d.b) << *it;
  ris << "]";
}
#else
sim dor(const c&) { ris; }
#endif
};
#define imie(x...) " [" #x ": " << (x) << "] "

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
template <typename A, typename B>
using unordered_map2 = __gnu_pbds::gp_hash_table<A, B>;
using namespace __gnu_pbds;
template <typename T> using ordered_set =
  __gnu_pbds::tree<T, __gnu_pbds::null_type, less<T>, __gnu_pbds::rb_tree_tag,
                   __gnu_pbds::tree_order_statistics_node_update>;
// ordered_set<int> s; s.insert(1); s.insert(2);
// s.order_of_key(1);    // Out: 0.
// *s.find_by_order(1);  // Out: 2.

using ld = long double;
using ll = long long;

constexpr int mod = 1000 * 1000 * 1000 + 7;
constexpr int odw2 = (mod + 1) / 2;

void OdejmijOd(int& a, int b) { a -= b; if (a < 0) a += mod; }
int Odejmij(int a, int b) { OdejmijOd(a, b); return a; }
void DodajDo(int& a, int b) { a += b; if (a >= mod) a -= mod; }
int Dodaj(int a, int b) { DodajDo(a, b); return a; }
int Mnoz(int a, int b) { return (ll) a * b % mod; }
void MnozDo(int& a, int b) { a = Mnoz(a, b); }
int Pot(int a, ll b) { int res = 1; while (b) { if (b % 2 == 1) MnozDo(res, a); a = Mnoz(a, a); b /= 2; } return res; }
int Odw(int a) { return Pot(a, mod - 2); }
void PodzielDo(int& a, int b) { MnozDo(a, Odw(b)); }
int Podziel(int a, int b) { return Mnoz(a, Odw(b)); }
int Moduluj(ll x) { x %= mod; if (x < 0) x += mod; return x; }

template <typename T> T Maxi(T& a, T b) { return a = max(a, b); }
template <typename T> T Mini(T& a, T b) { return a = min(a, b); }

constexpr int nax = 20000 * 500 * 4 + 100;

int tab_[nax * 2 + 1];
int* tab = tab_ + nax;

int pary_[nax * 2 + 1];
int* pary = pary_ + nax;

int n;
ll wynik;
int pref[505];

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);

  cin >> n;
  for (int i = 1; i <= n; i++) {
    cin >> pref[i];
    pref[i] += pref[i - 1];
  }

  for (int b = 0; b <= n; b++) {
    for (int cm = 0; cm < n; cm++) {
      for (int cp = cm + 1; cp <= n; cp++) {
        const int sum = pref[b] + pref[cp] - pref[cm];
        wynik += tab[-sum];
      }
    }
    for (int am = 0; am < n; am++) {
      for (int ap = am + 1; ap <= n; ap++) {
        const int sum = pref[ap] - pref[am] - pref[b];
        tab[sum]++;
      }
    }
  }

  debug() << imie(wynik);

  for (int a = 0; a < n; a++) {
    for (int b = a + 1; b <= n; b++) {
      const int sum = pref[b] - pref[a];
      pary[sum]++;
    }
  }
  for (int a = 0; a < n; a++) {
    for (int b = a + 1; b <= n; b++) {
      const int sum = pref[b] - pref[a];
      wynik -= 3 * pary[-sum * 2];
    }
  }

  wynik += 2 * pary[0];

  assert(wynik % 6 == 0);
  wynik /= 6;

  cout << wynik << endl;
  return 0;
}