MOD = 998244353

n, m = map(int, input().split())
if n == 0:
    print(0)
    exit()
if m <= 100:
    tot = 0
    for _ in range(m):
        tot ^= n 
        n <<= 1
    print(tot % MOD)
else:
    le = n.bit_length()
    tot =  0
    for _ in range(le):
        tot ^= n
        n <<= 1
    ans = 0
    max_ = le + m - 2
    for i in range(le - 1):
        ans += (tot >> i & 1) * pow(2, i, MOD)
        ans %= MOD
    i = le - 1
    ans -= (tot >> i & 1) * pow(2, i, MOD)
    ans %= MOD
    i = le
    ans += (tot >> (i - 1) & 1) * pow(2, max_ - (2 * le - 2 - i), MOD)
    ans %= MOD
    for i in range(le, 2 * le - 1):
        ans += (tot >> i & 1) * pow(2, max_ - (2 * le - 2 - i), MOD)
        ans %= MOD
    print(ans)