B

#include <bits/stdc++.h>


using namespace std;

#define int long long

const long long INF = 1e9 + 7;
const int MAXN = 200 + 10;
const int N = 1e5 + 10;

int Sum(int a1, int n, int d) {
    return (2 * a1 + d * (n - 1)) * n / 2;
}

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

    int n, s;
    cin >> n >> s;
    vector<int> a(n);
    for (int i = 0; i < n; ++i) {
        cin >> a[i];
    }
    int l = 0, sum = 0, ans = 0;
    for (int r = 0; r < n; ++r) {
        sum += a[r];
        while (sum > s && l <= r) {
            sum -= a[l];
            ++l;
        }
        ans += Sum(1, r - l + 1, 1);
    }
    cout << ans << '\n';
}