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