N, X = map(int, input().split())
A = list(map(int, input().split()))
if sum(A) <= X:
	print(sum(A))
	exit()
	
A = A + A
from collections import *
Q = deque()
ans = 0
val = 0
for i in range(2 * N):
	Q.append(A[i])
	val += A[i]
	while Q and val > X:
		val -= Q.popleft()
	ans = max(ans, val)
	
print(ans)