n, x = map(int, input().split())
a = list(map(int, input().split()))
a = a+a
rui = [0]
for i in a:
    rui.append(rui[-1]+i)

ans = 0
for i in range(n):
    l = i-1
    r = n+i+1
    while abs(l-r) > 1:
        mid = (l+r)//2
        if rui[mid]-rui[i] <= x:
            l = mid
        else:
            r = mid
    r -= 1
    ans = max(ans, rui[r]-rui[i])
print(ans)