import sys, time, random
from collections import deque, Counter, defaultdict
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
inf = 2 ** 63 - 1
mod = 998244353

n, x = mi()

a = li()

if sum(a) <= x:
    print(sum(a))
    exit()
    
a += a

ans = 0
right = 0
#n -> 数列の長さ
summ = 0
for left in range(2 * n):
    while right < 2 * n:
        summ += a[right]
        if summ <= x:
            right += 1
        else:
            summ -= a[right]
            break

    ans = max(ans, summ)

    if right == left:
        right += 1
    else:
        summ -= a[left]
print(ans)