import sys
sys.setrecursionlimit(5*10**5)
input = sys.stdin.readline
sys.set_int_max_str_digits(0)
from collections import defaultdict, deque, Counter
from heapq import heappop, heappush
from bisect import bisect_left, bisect_right
from math import gcd, lcm, factorial, perm, comb
from itertools import product, permutations, combinations
from functools import lru_cache #@lru_cache(maxsize=128)
#重複あり：list(product(list('123'),repeat = 2)),重複なし：list(permutations(list('123')))
MOD = 998244353

n,x = map(int,input().split())

l = list(map(int,input().split()))
l += l
#print(l)
s = [0]
ss=0
for i in range(2*n):
    ss+=l[i]
    s.append(ss)

ans=0
for i in range(1,2*n):
    ans = max(ans, s[i] - s[bisect_left(s,s[i]-x)])

print(ans)