N,K = map(int,input().split())
P = 998244353


C = N + 5
inv = [1] * C
for i in range(2,C):
    q = P // i
    r = P % i
    inv[i] = P - q * inv[r] % P
dp = [[0] * (N + 1) for _ in range(K + 1)]
for i in range(1,K + 1):
    dp[i][N] = 1
    for j in range(N - i,N):
        dp[i][j] = 1
for k in range(1,K + 1):
    s = k
    for j in range(N - k - 1,-1,-1):
        s += dp[k - 1][j + 1]
        s %= P
        dp[k][j] = s * inv[N - j] % P
print(dp[K][0])