import sys
input = sys.stdin.readline
N, X = map(int, input().split())
A = list(map(int, input().split()))
S = [0]
for a in A:
    S.append(S[-1]+a)
ans = 0
i = 0
j = 0
tmp = 0
while i<N:
    while j<i+N and tmp+A[j%N]<=X:
        tmp+=A[j%N]
        j+=1
    ans = max(ans, tmp)
    tmp-=A[i]
    i+=1
print(ans)