#include <bits/stdc++.h>

#define elif else if
#define ll long long
#define vll vector<long long>
#define vec vector
#define embk emplace_back
#define rep(i, n) for (ll i = 0; i < n; i++)
#define rep3(i, n, k) for (ll i = k; i < n; i++)
#define all(a) a.begin(), a.end()
#define YNeos(bool) (bool ? "Yes" : "No")
#define vllin(a, n) vll a(n); rep(i, n) cin >> a[i]
#define vchin(a, n) vec<char> a(n); rep(i, n) cin >> a[i]


using namespace std;
const ll INF = 1LL << 60;
const ll mod = 998244353;
//const ll mod = 1000000007;
const double pi = acos(-1);

//#ifdef ATCODER
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
//#endif

//Prototype declaration
template <class T, class... U> void gin(T&&, U&&...);
template <typename T> vector<T> read(ll);
template <typename T> void printvec(const T&);
template <class T, class... U> void printany(T&&, U&&...);

vector<ll> ruisekiwa (vector<ll> a) {
  vector<ll> suma(a.size() + 1);
  suma.at(0) = 0;
  for (int i = 0; i < a.size(); i++) suma.at(i + 1) = suma.at(i) + a.at(i);
  return suma;
}

//Main Program
int main() {
  ll n, x; gin(n, x);
  vllin(a, n);
  vll a2(n*2);
  rep(i, n) {
    a2[i] = a[i];
    a2[i+n] = a[i];
  }
  
  vll ruia2 = ruisekiwa(a2);
  ll ans = 0;
  rep (i, n*2) {
    auto itr = lower_bound(all(ruia2), x + ruia2[i]);
    itr--;
    ans = max(ans, *itr - ruia2[i]);
    //printany(i, itr - ruia2.begin(), *itr - ruia2[i]);
  }

  cout << ans << endl;
}


//Function Definition
void gin() {return;}
template <class T, class... U> void gin(T&& now,  U&&... next) {
  cin >> now;
  gin(forward<U> (next)...);
}

template <typename T> vector<T> read(ll n) {
  vector<T> v(n);
  for (int i = 0; i < n; i++) cin >> v[i];
  return v;
}

template <typename T> void printvec(const T& a) {
  for (int i = 0; i < a.size(); i++) {
    cout << a[i];
    if (i == a.size() - 1) cout << endl;
    else cout << ' ';
  }
}

void printany() {cout << endl;}
template <class T, class... U> void printany(T&& now, U&&... next) {
  cout << now << ' ';
  printany(forward<U> (next)...);
}