def max_polygons(N, X, A):
    left = 0
    total = 0
    max_total = 0
    for right in range(N):
        total += A[right]
        while total > X:
            total -= A[left]
            left += 1
        max_total = max(max_total, total)
    return max_total
#スライディングウィンドウ
N, X = map(int, input().split())
A = list(map(int, input().split()))

print(max_polygons(N, X, A))