N,M=map(int,input().split())
mod=998244353
dp=[0 for _ in range(N+1)]
dp[-1]=1
inv=[pow(i,mod-2,mod) for i in range(N+1)]
for _ in range(M):
	dp2=[0 for _ in range(N+1)]
	dp2[-1]=1
	a=0
	for j in range(N):
		a+=dp[-j-1]
		a%=mod
		dp2[-j-2]=a*inv[j+1]%mod
	dp=dp2.copy()
print(dp[0])