#include <bits/stdc++.h> using namespace std; using ll = long long; using V = vector<ll>; using VV = vector<V>; using VVV = vector<VV>; using VVVV = vector<VVV>; using VVVVV = vector<VVVV>; using VVVVVV = vector<VVVVV>; using VS = vector<string>; using VB = vector<bool>; using VVB = vector<VB>; using P = pair<ll,ll>; using M = map<ll,ll>; using Q = queue<ll>; using PQ = priority_queue<ll>; using PQG = priority_queue<ll,V,greater<ll>>; using S = set<ll>; using VP = vector<P>; const ll MOD = 1000000007; const ll mod = 998244353; const ll INF = 1LL << 60; #define rep(i,n) for(ll i = 0; i < n; i++) #define rep2(i,s,n) for(ll i = s; i < n; i++) #define per(i,n) for(ll i = n-1; i >= 0; i--) #define per2(i,s,n) for(ll i = n-1; i >= s; i--) #define all(x) (x).begin(),(x).end() #define rall(x) (x).rbegin(),(x).rend() #define fi first #define se second #define pb push_back #define pf push_front #define ppb pop_back #define ppf pop_front #define eb emplace_back #define lb lower_bound #define ub upper_bound #define cfix(x) fixed<<setprecision(x) template<class T>bool chmin(T&a, const T&b){if(a>b){a=b;return true;}return false;} template<class T>bool chmax(T&a, const T&b){if(a<b){a=b;return true;}return false;} template<class T>void Vin(vector<T>&a){rep(i,(ll)a.size())cin>>a[i];} template<class T>void VVin(vector<vector<T>>&a){rep(i,(ll)a.size())Vin(a[i]);} template<class T>void Vout(const vector<T>&a){rep(i,(int)a.size()-1)cout<<a[i]<<" ";cout<<a.back()<<'\n';} template<class T>void Voutl(const vector<T>&a){rep(i,(int)a.size())cout<<a[i]<<'\n';} ll power(ll a,ll b,const ll&M){a%=M;ll res=1;while(b>0){if(b&1)res=res*a%M;a=a*a%M;b>>=1;}return res;} const ll H[4] = {0,1,0,-1}, W[4] = {1,0,-1,0}; int main() { cin.tie(nullptr); ios::sync_with_stdio(false); ll t; cin >> t; rep(eggkid, t) { ll n, x; cin >> n >> x; if(x % 2) { cout << (n + 1) / 2 % mod << endl; } else { if(n < x) cout << (n + 1) / 2 % mod << endl; else cout << (x / 2 + 1 + (n - x) / (x + 3) * (x / 2 + 2) + (n - x) % (x + 3) / 2) % mod << endl; } } }