#include <bits/stdc++.h> using namespace std; #define modulo 998244353 #define mod(mod_x) ((((long long)mod_x+modulo))%modulo) #define Inf 2000000005 int main(){ int N,M; cin>>N>>M; vector<int> dp(M+1,0); dp[0] = 1; for(int i=0;i<M;i++){ dp[i+1] = mod(dp[i+1] + dp[i]); if(N!=1&&i+N<=M){ dp[i+N] = mod(dp[i+N] + dp[i]); } } cout<<dp.back()<<endl; return 0; }