import sys
input = sys.stdin.readline

mod = 998244353
N, K = map(int, input().split())
inv = [0] + [pow(i, mod-2, mod) for i in range(1, N+1)]
prob = [0] * (N+1)
prob[0] = 1
for i in range(K):
    nprob = [0] * (N+1)
    for j in range(N):
        nprob[j+1] = (nprob[j] + prob[j]) % mod
    for j in range(1, N+1):
        nprob[j] = nprob[j] * inv[j] % mod
    nprob[0] = 1
    prob = nprob
print(prob[N])