import sys, random
input = lambda : sys.stdin.readline().rstrip()


write = lambda x: sys.stdout.write(x+"\n"); writef = lambda x: print("{:.12f}".format(x))
debug = lambda x: sys.stderr.write(x+"\n")
YES="Yes"; NO="No"; pans = lambda v: print(YES if v else NO); INF=10**18
LI = lambda : list(map(int, input().split())); II=lambda : int(input())
def debug(_l_):
    for s in _l_.split():
        print(f"{s}={eval(s)}", end=" ")
    print()
def dlist(*l, fill=0):
    if len(l)==1:
        return [fill]*l[0]
    ll = l[1:]
    return [dlist(*ll, fill=fill) for _ in range(l[0])]

n,m = list(map(int, input().split()))
M = 998244353
dp0 = 1
dp1 = 0
val = n
for i in range(31)[::-1]:
    v = m>>i&1
    if v:
        ndp0 = val * dp0 % M
        ndp1 = val * dp1 % M + dp1 + dp0
    else:
        ndp0 = dp0
        ndp1 = val * dp1 % M + dp1
    dp0 = ndp0%M
    dp1 = ndp1%M
print((dp0+dp1)%M)