fn main() {
    input!{
        n: usize, x: usize,
        a: [usize; n],
    }

    // aを2つつなげる
    let mut aa = Vec::new();
    for i in 0..n { aa.push(a[i]);}
    for i in 0..n { aa.push(a[i]);}

    // 尺取り法でx未満のmaxを見つける
    let mut ans = 0;
    let mut tail = 0;
    let mut top = 0;
    let mut now = 0;
    while tail < 2*n {
        while top < 2*n && now < x { 
            now += aa[top];
            top += 1;
        }
        if top - tail > 0 {
            ans = max(ans, now - aa[top-1]);
        }
        now -= aa[tail];
        tail += 1;
    }
    println!("{ans}");
}
// ---------- begin input macro ----------
#[macro_export]
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
    ($($r:tt)*) => {
        let s = {
            use std::io::Read;
            let mut s = String::new();
            std::io::stdin().read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}

#[macro_export]
macro_rules! input_inner {
    ($iter:expr) => {};
    ($iter:expr, ) => {};
    ($iter:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($iter, $t);
        input_inner!{$iter $($r)*}
    };
}

#[macro_export]
macro_rules! read_value {
    ($iter:expr, ( $($t:tt),* )) => {
        ( $(read_value!($iter, $t)),* )
    };
    ($iter:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
    };
    ($iter:expr, chars) => {
        read_value!($iter, String).chars().collect::<Vec<char>>()
    };
    ($iter:expr, bytes) => {
        read_value!($iter, String).bytes().collect::<Vec<u8>>()
    };
    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };
    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}
// ---------- end input macro ----------
#[allow(unused)]
use std::{
	io::stderr, io::stdin, io::BufRead, io::Write,
	mem::swap,
	cmp::min, cmp::max,
	cmp::Reverse,
	collections::HashSet, collections::BTreeSet,
	collections::HashMap, collections::BTreeMap,
	collections::BinaryHeap,
	collections::VecDeque,
};