from itertools import accumulate

import sys


def printe(*args, end="\n", **kwargs):
    print(*args, end=end, file=sys.stderr, **kwargs)


def main():
    N, X = map(int, input().split())
    A = list(map(int, input().split()))
    if sum(A) <= X:
        print(sum(A))
        return

    A_cp = [0]
    A_cp.extend(A)
    A_cp.extend(A)
    accum_A = list(accumulate(A_cp))
    printe(accum_A)
    max_value = 0
    for init_idx in range(N):
        lower = init_idx
        upper = init_idx + N
        while upper - lower > 1:
            mid = (upper + lower) // 2
            if accum_A[mid] - accum_A[init_idx] > X:
                upper = mid
            else:
                lower = mid
        max_value = max(max_value, accum_A[lower] - accum_A[init_idx])
    print(max_value)


if __name__ == "__main__":
    main()