i = input().split()
N = int(i[0])
K = int(i[1])

a =[0]*N

for i in range(N):
    a[i] = int(input())

b = [True] + [False]*K
l = len(b)
an = 0

for i in range(N):
    n = a[i]
    for j in range(l):
        if b[-(j+1)] != False:
            index = l-j-1
            if n + index <= K and b[n+index] == False:
                b[n+index] = True
                if n + index > an:
                    an = n + index

print(an)