n = int(input())
s = 1 << n
C = list(map(int, input().split()))
L = [0] * s
H = [0] * s
for i in range(s):
    L[i], H[i] = map(int, input().split())

MOD = 998244353
for k in range(n):
    d = 1 << k
    m = d << 1
    for i in range(0, s, m):
        for j in range(d):
            x = C[i + j + 0]
            y = C[i + j + d]
            C[i + j + 0] = x + y
            C[i + j + d] = x - y

ans = 0
for i in range(s):
    if C[i] < 0:
        ans += C[i] * L[i] % MOD
    else:
        ans += C[i] * H[i] % MOD
    ans %= MOD

print(ans * pow(s, MOD - 2, MOD) % MOD)