from functools import lru_cache

MOD = 998244353
H, W = map(int, input().split())

@lru_cache(200**2)
def f(h, w):
    if h <= 1 or w <= 1:
        return 1
    result = 0
    for i in range(1, w+1):
        result += f(i, h-1) * pow(2, (w-i) * (h-1) + max(i-2, 0), MOD) % MOD
        result %= MOD
    return result

print(f(H, W))