import sys, random
input = lambda : sys.stdin.readline().rstrip()


write = lambda x: sys.stdout.write(x+"\n"); writef = lambda x: print("{:.12f}".format(x))
debug = lambda x: sys.stderr.write(x+"\n")
YES="Yes"; NO="No"; pans = lambda v: print(YES if v else NO); INF=10**18
LI = lambda : list(map(int, input().split())); II=lambda : int(input()); SI=lambda : [ord(c)-ord("a") for c in input()]
def debug(_l_):
    for s in _l_.split():
        print(f"{s}={eval(s)}", end=" ")
    print()
def dlist(*l, fill=0):
    if len(l)==1:
        return [fill]*l[0]
    ll = l[1:]
    return [dlist(*ll, fill=fill) for _ in range(l[0])]

n = int(input())
a = list(map(int, input().split()))
M = 998244353
ans = 0
vals = [0]*(n+1)
for i in range(1,n+1):
    val = pow(2, i, M) - 1
    vals[i] = val
for i in range(n):
    val = -vals[i] + vals[n-1-i]
    ans += a[i] * (val) % M
    ans %= M
#     print(i, val)
print(ans%M)