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

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

P = 998244353


ans = 0

f = [1]

for i in range(1, M + 1):
    
    f += [f[-1] * i % P]
    
    
for i in range(M // N + 1):
    
    j = M - i * N
    
    ans += f[i + j] * pow(f[i] * f[j], P - 2, P)
    ans %= P
    
print(ans)