import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
sys.setrecursionlimit(10**7)
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 = ni()

a = na()
s = sum(a)
mod = 998244353
z = 0
for i in range(n):
    z^=a[i]

def f(x):
    return (1-pow(-pow(3,mod-2,mod),x,mod))*pow(2,mod-2,mod)%mod

if z==0:
    print(f(s))
else:
    print(f(s-z+1))