n,m=map(int,input().split());M=998244353;F=[1]
for i in range(m+100):F+=F[i]*-~i%M,
C=lambda A,B:F[A]*pow(F[A-B]*F[B],M-2,M)%M
print(sum(C(m-n*k+k,k)for k in range(m//n))%M)
if m<n:
    0/0