N,P=map(int,input().split())
Q=998244353
f=[1]*(N+1)
a=1
for i in range(1,N+1):
	a=(a*i)%Q
	f[i]=a
for i in range(N//P+1):a-=f[N]*pow(f[N-i*P]*f[i],-1,Q)*pow(P,-i,Q)
print(a%Q)