#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using ll = long long;
#define rep(i,n) for(int i=0;i<(int)(n);i++)
using mint = atcoder::modint998244353;

int main(){
	int n,x;
	cin>>n>>x;
	vector<int> a(n*2);
	rep(i,n) cin>>a.at(i);
	rep(i,n) a.at(i+n)=a.at(i);
	{
		ll sm=0;
		rep(i,n) sm+=a.at(i);
		if(sm<=x){
			cout<<sm<<"\n";
			return 0;
		}
	}
	vector<ll> sm(n*2+1);
	rep(i,n*2) sm.at(i+1)=sm.at(i)+a.at(i); 
	ll ans=0;
	rep(i,n){
		auto itr=upper_bound(sm.begin(),sm.end(),sm.at(i)+x);
		itr--;
		ans=max(ans,*itr-sm.at(i));
	}
	cout<<ans<<endl;
}