#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using ld = long double;
using mint = modint998244353;

ll N, X, A[202020], sum[404040];

int main() {
  cin >> N >> X;
  for (int i = 0; i < N; i++) cin >> A[i];
  for (int i = 0; i < 2 * N; i++) {
    sum[i + 1] = sum[i] + A[i % N];
  }
  ll ans = 0;
  int r = 0;
  for (int l = 0; l < 2 * N; l++) {
    while (r < 2 * N && r - l + 1 <= N && sum[r + 1] - sum[l] <= X) {
      ans = max(ans, sum[r + 1] - sum[l]);
      r++;
    }
  }
  cout << ans << endl;
  return 0;
}