MOD = 998244353

n, k = map(int, input().split())
dp = [0] * (n + 1)
dp[0] = 1
ans = 0
inv = [pow(i, MOD - 2, MOD) for i in range(n + 1)]
for _ in range(k):
    ndp = [0] * (n + 1)
    for i in range(n):
        ndp[i + 1] += dp[i] * inv[n - i] % MOD
    for i in range(1, n + 1):
        ndp[i] += ndp[i - 1]
        ndp[i] %= MOD
    ans += ndp[n]
    ans %= MOD
    dp = ndp

print(ans)