import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################

mod = 998244353
k, n = na()

if n == 1:
    if k == 1:
        print(2)
    else:
        print(3)

f = [0] * (1 + n)

for i in range(1, n + 1):
    f[i] = pow(2, i, mod)

for i in range(1, n + 1):
    for j in range(i * 2, n + 1, i):
        f[j] -= f[i]
        f[j] %= mod

print(f[n])