import sys
input = sys.stdin.readline

N,M=map(int,input().split())
mod=998244353

FACT=[1]
for i in range(1,2*10**6+1):
    FACT.append(FACT[-1]*i%mod)

FACT_INV=[pow(FACT[-1],mod-2,mod)]
for i in range(2*10**6,0,-1):
    FACT_INV.append(FACT_INV[-1]*i%mod)

FACT_INV.reverse()

def Combi(a,b):
    if 0<=b<=a:
        return FACT[a]*FACT_INV[b]*FACT_INV[a-b]%mod
    else:
        return 0

if N==1:
    print(1)
else:        
    ANS=0
    for i in range(M):
        ANS=ANS+Combi(M-(N-1)*i,i)
        ANS%=mod

    print(ANS)