N, k = list(map(int, input().split()))
mod = 998244353
mat_len = k ** 3


def mul(A, B) :
    C = [[0 for _ in range(mat_len)] for _ in range(mat_len)]
    for i in range (mat_len):
        for j in range(mat_len):
            for k in range(mat_len):
                C[i][j]+=A[i][k]*B[k][j]%mod
            C[i][j]%=mod
    return C



B = [[0] * mat_len for _ in range(mat_len)]
for i in range(k):
    for j in range(k):
        for l in range(k):
            cur = i*k*k+j*k+l
            B[i*k*k+j*k+(l+1)%k][cur] += 1
            B[i*k*k+(j+l)%k*k+l][cur] += 1
            B[(i+j)%k*k*k+j*k+l][cur] += 1



ans = [[0] * mat_len for _ in range(mat_len)]
for i in range(mat_len):
    ans[i][i] = 1



while N:
    if N & 1:
        ans = mul(ans, B)
    B=mul(B, B)
    N>>=1




ret = 0
for i in range(k**2):
    ret = (ret + ans[i][0])%mod



print(int(ret))