mod=998244353

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

DP=[[0]*2020 for i in range(2020)]

for i in range(2020):
    for j in range(2020):
        if j<=i:
            DP[i][j]=1

for i in range(1,2020):
    S=[0]
    for j in range(2020):
        S.append((S[-1]+DP[i-1][j])%mod)

    for j in range(i+1,2020):
        DP[i][j]=S[j]*pow(j,mod-2,mod)%mod

print((DP[K][N])%mod)