## https://yukicoder.me/problems/no/1967

MOD = 998244353

def main():
    N, K = map(int, input().split())

    dp = [[0] * (K + 1) for _ in range(N + 1)]
    cum_dp = [[0] * (K + 1) for _ in range(N + 1)]
    for j in range(K + 1):
        dp[-1][j] = 1
        cum_dp[-1][j] = 1

    for i in reversed(range(N)):
        a = N - i
        inv_a = pow(a, MOD - 2, MOD)

        for k in range(K):
            y = cum_dp[i + 1][k + 1]
            y *= inv_a
            y %= MOD
            dp[i][k] = y

        for k in range(K + 1):
            cum_dp[i][k] = (cum_dp[i + 1][k] + dp[i][k]) % MOD
    
    print(dp[0][0])
    






if __name__ == "__main__":
    main()