#include <bits/stdc++.h>
using namespace std;
using ll=long long;
using pll=pair<ll,ll>;
using tll=tuple<ll,ll,ll>;
using ld=long double;
const ll INF=(1ll<<60);
#define rep(i,n) for(ll i=0;i<(ll)(n);i++)
#define all(v) v.begin(),v.end()
template<class T> void chmin(T &a,T b){
    if(a>b){
        a=b;
    }
}
template<class T> void chmax(T &a,T b){
    if(a<b){
        a=b;
    }
}
int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    ll n,x;
    cin >> n >> x;
    vector<ll> a(2*n);
    rep(i,n){
        cin >> a[i];
        a[n+i]=a[i];
    }
    vector<ll> sum(2*n+1,0);
    rep(i,2*n) sum[i+1]=sum[i]+a[i];
    ll ans=0;
    rep(i,n+1){
        ll idx=upper_bound(all(sum),sum[i]+x)-sum.begin();
        idx--;
        chmin(idx,i+n);
        chmax(ans,sum[idx]-sum[i]);
    }
    cout << ans << '\n';
}