MOD=998244353

fac=[1,1]
inv=[1,1]
ifac=[1,1]
for i in range(2,3*(10**6)):
    fac.append(fac[i-1]*i%MOD)
    inv.append(MOD-(MOD//i)*inv[MOD%i]%MOD)
    ifac.append(inv[i]*ifac[i-1]%MOD)

def comb(n,k):
    return fac[n]*ifac[k]%MOD*ifac[n-k]%MOD

N,M=map(int,input().split())

if N==1:
    print(1)
    exit(0)

a=0
ans=0
while a*N<=M:
    b=M-a*N
    ans=(ans+comb(a+b,a))%MOD
    a+=1
print(ans)