MOD = 998244353
m1 = 999630629

def main():
    import sys
    input = sys.stdin.read
    data = input().split()
    N = int(data[0])
    A = list(map(int, data[1:N+1]))
    sum_A = sum(A)
    sum_A_mod = sum_A % MOD
    pow_2 = pow(2, N-1, MOD)
    if sum_A < m1:
        Q = 0
    else:
        Q = pow(2, N-1, MOD)
    m1_mod = m1 % MOD
    term1 = (sum_A_mod * pow_2) % MOD
    term2 = (m1_mod * Q) % MOD
    result = (term1 - term2) % MOD
    print(result)

if __name__ == "__main__":
    main()