#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic warning "-Wunused-function"
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n, x;
  cin >> n >> x;
  VI a(2 * n);
  rep(i, n) cin >> a[i], a[n+i] = a[i];
  ll now = 0;
  int r = 0;
  ll ans = 0;
  rep(l, n) {
    while (r - l < n && now + a[r] <= x) {
      now += a[r++];
    }
    chmax(ans, now);
    if (l == r) r++;
    else now -= a[l];
  }
  cout << ans << '\n';
}