#define _USE_MATH_DEFINES
#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <queue>
#include <math.h>
#include <cmath>
#include <stack>
#include <map>
#include <set>
#include <numeric>
#include <iomanip>
#include <climits>
#include <functional>
#include <cassert>
#include <tuple>
using namespace std;
using ll = long long;

int N;
ll X;
ll A[200009];

int main() {

    cin >> N >> X;
    for(int i = 1; i <= N; ++i) cin >> A[i];
    vector<ll> S(2*N+1, 0);
    for(int i = 1; i <= 2*N; ++i) S[i] = S[i-1]+A[(i-1)%N+1];

    ll mx = 0;
    for(int i = 0; i < N; ++i) {
        int r = upper_bound(S.begin(), S.end(), S[i]+X)-S.begin();
        r--;
        if(r-i > N) mx = max(mx, S[i+N]-S[i]);
        else mx = max(mx, S[r]-S[i]);
    }

    cout << mx << endl;

}