MOD = 998244353
fact = [1] * 220000

def inv(x):
    return pow(x, MOD-2, MOD)

for i in range(1, 220000):
    fact[i] = fact[i-1] * i % MOD

N, P = map(int, input().split())

C = 1

ans = 0

ans += C ## C0
for k in range(1, N//P + 1):
    C = C * fact[N - (k-1) * P] * inv(k * P * fact[N-k*P])
    C %= MOD
    ans += C

print((fact[N] - ans) % MOD)