import sys
input = sys.stdin.readline

N=int(input())
A=list(map(int,input().split()))

if N>=16:
    print(2**16-1)
    exit()

DP=[0]*(1<<16)
DP[0]=1

for a in A:
    k=a
    while k%2==0:
        k//=2

    for i in range((1<<16)-1,-1,-1):
        if DP[i]==1:
            for b in range(16):
                u=i
                
                for t in range(16):
                    if k & (1<<t) != 0:
                        u |= 1<< ((b+t)%16)

                DP[u]=1

ANS=0
for i in range(1<<16):
    if DP[i]==1:
        ANS=i

print(ANS)