#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll;
 
int main() {
    ll n, k;
    cin >> n >> k;
 
    vector<ll> a(n);
 
    for(ll i = 0; i < n; i++)
        cin >> a[i];
 
    ll l = 0;
    ll sum = 0;
    ll ans = 0;
 
    for(ll r = 0; r < n; r++) {
        sum += a[r];
 
        while(sum >= k) {
            ans += n - r;
 
            sum -= a[l];
            l++;
        }
    }
 
    cout << ans << '\n';
 
    return 0;
}

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