#include <bits/stdc++.h>
#define fast cin.tie(0)->sync_with_stdio(0);
#define int long long
#define inf ((int)1e18)
using namespace std;
void solve1(int n) {
vector <int> arr(n);
for(int i = 0; i < n; i++) {
cin >> arr[i];
}
auto compress = [&](vector <int> &a) {
vector <pair<int, int> > v(a.size());
for(int i = 0; i < n; i++) {
v[i] = {a[i], i};
}
sort(v.begin(), v.end());
for(int i = 0, ind = 0; i < n; i++) {
if(i and v[i].first != v[i - 1].first) ind++;
a[v[i].second] = ind;
}
};
compress(arr);
int ans = 0;
for(int l = 0; l < n; l++) {
vector <int> cnt(n);
int mx = 0;
for(int r = l; r < n; r++) {
cnt[arr[r]]++;
mx = max(mx, cnt[arr[r]]);
if(mx > (r - l + 1) / 2) ans++;
}
}
cout << ans << "\n";
}
void solve2(int n) {
vector <int> arr(n+1), pre(n+1);
for(int i = 1; i <= n; i++) {
cin >> arr[i];
if(arr[i] == 2) arr[i] = -1;
pre[i] = arr[i] + pre[i-1];
}
int sub = 0;
map <int, int> mp;
for(int i = n; i > 0; i--) {
mp[pre[i]]++;
sub += mp[pre[i - 1]];
}
cout << n * (n + 1) / 2 - sub << "\n";
}
int32_t main(){
fast
int n;
cin >> n;
if(n <= 2000) solve1(n);
else solve2(n);
}
