#include <bits/stdc++.h>
#define int ll
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define rng(i,c,n) for(int i=c;i<n;i++)
#define fi first
#define se second
#define pb push_back
#define sz(a) (int)a.size()
#define vec(...) vector<__VA_ARGS__>
#define _4aNWZeC ios::sync_with_stdio(0),cin.tie(0)
using ll=long long;
using pii=pair<int,int>;
using vi=vector<int>;
void print(){cout<<'\n';}
template<class h,class...t>
void print(const h&v,const t&...u){cout<<v<<' ',print(u...);}

void slv(){
	int n,tar;
	cin>>n>>tar;
	
	vi a(n);
	rep(i,n){
		cin>>a[i];
	}
	rep(i,n){
		a.pb(a[i]);
	}

	int n2=n*2;
	vi ps;
	rep(i,n2){
		ps.pb((!sz(ps)?0:ps.back())+a[i]);
	}
	set<int> st;
	int ans=0;
	per(i,n2){
		// -lo + ps[i] <= tar
		// ps[i] <= tar + lo
		st.insert(ps[i]);
		int lo=!i?0:ps[i-1];
		auto it=st.upper_bound(tar+lo);
		if(it!=st.begin()){
			it=prev(it);
			ans=max(ans,*it-lo);
		}
	}
	cout<<min(ans,ps[n-1])<<"\n";
}

signed main(){
_4aNWZeC;
	slv();
}