MOD = 998244353

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

if N > M:
    print(1 % MOD)
else:
    from collections import defaultdict
    sum_prev = defaultdict(int)
    sum_prev[0] = 1  # Initialize for i=0
    dp0_prev = 1
    dp1_prev = 0
    
    for i in range(1, M + 1):
        current_dp0 = (dp0_prev + dp1_prev) % MOD
        r = i % N
        current_dp1 = 0
        if i >= N:
            current_dp1 = sum_prev.get(r, 0) % MOD
        # Update sum_prev with current_dp0 for the current remainder
        sum_prev[r] = (sum_prev.get(r, 0) + current_dp0) % MOD
        # Update dp0_prev and dp1_prev for the next iteration
        dp0_prev, dp1_prev = current_dp0, current_dp1
    
    print((dp0_prev + dp1_prev) % MOD)