MOD = 998244353
N,K = map(int,input().split())
dp = [[0 for _ in range(N+1)] for _ in range(N+1)]
for j in range(N+1):
    for i in range(j+1):
        dp[i][j] = 1
for i in range(2,N+1):
    dp[i][1] = pow(i,MOD-2,MOD)
for j in range(2,N):
    S = j+dp[j][j-1]
    dp[j+1][j] = S*pow(j+1,MOD-2,MOD)%MOD
    for i in range(j+2,N+1):
        S = S+dp[i-1][j-1]
        dp[i][j] = S*pow(i,MOD-2,MOD)%MOD
print(dp[N][K])