import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################
n,x = na()

a = na()
a = [0] + a + a
for i in range(2*n):
    a[i+1] += a[i]

ans = 0
j = 0
for i in range(n*2):
    while j < 2 * n and a[j+1] - a[i] <= x:
        j += 1
    ans = max(ans,a[j]-a[i])
print(min(ans, a[n]))