N,K = map(int, input().split())
P = 998244353
inv6 = pow(6, P-2, P)

def merge(LIST1, LIST2):
    ans = [0,0,0,0,0,0]
    for i in range(6):
        for j in range(6):
            ans[(i+j)%6] += LIST1[i] * LIST2[j]
    return [a%P for a in ans]



memo = [inv6 for _ in range(6)]
if N%2 == 1:
    ans = memo[:]
else:
    ans = None

N >>= 1
while N > 0:
    memo = merge(memo, memo)
    if N%2 == 1:
        if ans is None:
            ans = memo[:]
        else:
            ans = merge(ans, memo)
    N >>= 1

print(memo[K]%P)