import sys
input = sys.stdin.readline
def read_values(): return tuple(map(int, input().split()))
def read_list(): return list(read_values())

mod = 998244353

def main():
    n,m = read_values()
    f = [1] * (n + m * 2 + 1)
    rf = [1] * (n + m * 2 + 1)
    for i in range(n+m*2):
        f[i + 1] = f[i] * (i + 1) % mod
        rf[i + 1] = pow(f[i + 1], -1, mod)
    ans = 0
    for i in range(m):
        if i * 2 - n + 1 < 0:
            continue
        ans += f[i * 2] * rf[n - 1] % mod * rf[i * 2 - n + 1]
        ans %= mod
    print(ans)    

if __name__ == "__main__":
    main()