F

#include<bits/stdc++.h>
using namespace std;

#define ll long long
#define nl "\n"

void files(){
    ios_base::sync_with_stdio(false),cin.tie(NULL),cout.tie(NULL);
    #ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
    #endif
}


void solve(){
    ll n,k; cin>>n>>k;
    vector<ll> v(n);
    for(auto&i:v) cin>>i;

    ll ans = n*(n+1)/2;

    ll exclude = 0;

    ll l=0,r=0, sum = 0;

    while(r<n){
        sum += v[r];
        while(sum >= k){
            sum -= v[l];
            l++;
        }
        exclude += r-l+1;
        r++;
    }

    cout<<ans-exclude<<nl;

}

int main(){
    files();
    int t = 1;
    // cin>>t;
    while(t--) solve();

    return 0;
}