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

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, x;
    cin >> n >> x;
    vector<int> a(n);
    vector<ll> s(2 * n + 1);
    for(int i = 0; i < n; i++){
        cin >> a[i];
        s[i + 1] = s[i] + a[i];
    }
    for(int i = 0; i < n; i++) s[i + 1 + n] = s[i + n] + a[i];
    ll ans = 0;
    for(int l = 0, r = 0; l < n; l++){
        r = max(r, l);
        while(r <= l + n && s[r] <= s[l] + x){
            ans = max(ans, s[r] - s[l]);
            r++;
        }
    }
    cout << ans << '\n';
}