#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef vector<ll> vll;
typedef vector<vll> vvll;
typedef vector<vvll> vvvll;
typedef vector<string> vstr;
typedef pair<ll, ll> pll;
typedef vector<pll> vp;
typedef map<ll, ll> mll;
typedef map<string, ll> mstrll;
#define pb push_back
#define mp make_pair
#define fir first
#define sec second
#define maxs(x, y) (x = max(x, y))
#define mins(x, y) (x = min(x, y))
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
#define _overload3(_1, _2, _3, name, ...) name
#define _rep(i, n) repi(i, 0, n)
#define repi(i, a, b) for(ll i = ll(a); i < ll(b); i++)
#define rep(...) _overload3(__VA_ARGS__, repi, _rep,)(__VA_ARGS__)
#define each(i, n) for(auto&& i: n)
#define out(x) cout << (x)
#define indent() cout << '\n'
#define print(x) cout << (x) << '\n'
#define debug(x) cerr << #x << ": " << (x) << '\n'
ll gcd(ll a, ll b){return b != 0 ? gcd(b, a % b) : a;}
ll lcm(ll a, ll b){return a / gcd(a, b) * b;}
ll factorial(ll a){return a < 2 ? 1 : factorial(a - 1) * a;}
ll summation(ll a){return a < 1 ? 0 : (a * a + a) / 2;}
const ll INF = 1e16;
const ll MOD = 1e9 + 7;
const ll N = 200005;
const ll M = 100005;
ll n, m, x, y, z, w, h, ans, cnt, mx, mn;
string s, t, alphabet = "abcdefghijklmnopqrstuvwxyz";
ll dx[] = {-1, 0, 1, 0}, dy[] = {0, -1, 0, 1};
vll v;
//vll dx = {-1, 0, 1, -1, 1, -1, 0, 1}, dy = {-1, -1, -1, 0, 0, 1, 1, 1};

signed main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    while(cin >> n){
        ll a[n + 1] = {};
        rep(i, 1, n + 1){
            cin >> x;
            a[i] = a[i - 1] + x;
        }
        ans = 0;
        sort(a, a + n + 1);
        rep(i, a[0], a[n] + 1){
            ans += summation(count(a, a + n + 1, i) - 1);
        }
        print(ans);
    }
}
