#include <bits/stdc++.h>
#ifdef LOCAL
#include "./debug.cpp"
#else
#define debug(...)
#define print_line
#endif
using namespace std;
using ll = long long;

int main() {
	int N;
	ll X;
	cin >> N >> X;
	vector<ll> A(2 * N);
	for (int i = 0; i < N; i++) {
		cin >> A[i];
		A[i + N] = A[i];
	}

	ll ans = 0, now = 0;
	int l = 0, r = 0;
	while (l < N) {
		while (r < l + N && now + A[r] < X) {
			now += A[r];
			ans = max(ans, now);
			r++;
		}
		now -= A[l];
		l++;
		if (r < l) {
			r = l;
			now = 0;
		}
	}

	cout << ans << endl;
}