#include <iostream>
#include <vector>

using namespace std;

int main()
{
    int n, k, i, j, leftp = 0;
    cin >> n >> k;

    vector<short> flowers(n);

    for (i = 0; i < n; i++)
    {
        cin >> flowers[i];
        leftp += flowers[i];
    }

    i = 0, j = 0;
    int pickable = flowers[0];
    leftp -= flowers[0];

    long out = 0;

    while (j < n)
    {
        while (pickable < k || i > j)
        {
            j++;

            if (j >= n)
            {
                cout << out;
                return 0;
            }

            pickable += flowers[j];
            leftp -= flowers[j];
        }

        out += leftp + 1;
        i++;
        pickable -= flowers[i];

        while (flowers[i] == 0)
        {
            i++;
            pickable -= flowers[i];
        }
    }

    cout << out;
}