using System; using System.Collections.Generic; using System.Collections; using System.Collections.Specialized; using System.Linq; using System.Text; using System.Text.RegularExpressions; using System.IO; using System.Reflection; using static System.Math; using System.Numerics; using System.Threading; using System.Runtime.CompilerServices; using System.Diagnostics; static class Program{ const long inf=long.MaxValue>>1; const int mod=998244353; static Sc sc=new Sc(); static void Main(){ new Pt(Solve).Sm(); } static void Solve(Pt pt) { var (n,m)=sc.Tp2(); long ans=0,p=0; var t=Binary(n,0); int c=t.Length+m-1,z=n; for(int i = 0;i < c;i++) { if(z==0&&m>i) { var g1=new long[][]{ new long[]{2,1}, new long[]{0,1} }; var b1=new long[]{0,p}; var e=Mp(b1,g1,c-i-t.Length+1)[0]; ans=(ans+e*Fp(2,i))%mod; i=m-1; continue; } var f=m<=i?((n>>(i-m))&1):0; var g=z&1; p^=f^g; ans=(ans+p*Fp(2,i))%mod; z>>=1; } pt.Wl(ans); } static long Fp(long x,long e){ long r=1; while(e>0){ if((e&1)>0){r*=x;r%=mod;} x=x*x%mod; e>>=1; } return r; } static string Binary(long a,int b){ string s=Convert.ToString(a,2); return (b>s.Length?new string('0',b-s.Length):"")+s; } static long[] Mp(long[] r,long[][] x,long e){ while(e>0){ if((e&1)>0){r=Mm(x,r);} x=Mm(x,x); e>>=1; } return r; } static long[] Mm(long[][] a,long[] b){ var q=new long[b.Length]; for(int j=0;j f){f(this);} public void W(int s){sb.Append(s);} public void W(long s){sb.Append(s);} public void W(double s){sb.Append(s);} public void W(decimal s){sb.Append(s);} public void W(char s){sb.Append(s);} public void W(string s){sb.Append(s);} public void W(object s){sb.Append(s);} public void W(string f,int s){sb.Append(s.ToString(f));} public void W(string f,long s){sb.Append(s.ToString(f));} public void W(string f,double s){sb.Append(s.ToString(f));} public void W(string f,decimal s){sb.Append(s.ToString(f));} public void Wl(int s){sb.Append(s).Append(Environment.NewLine);} public void Wl(long s){sb.Append(s).Append(Environment.NewLine);} public void Wl(double s){sb.Append(s).Append(Environment.NewLine);} public void Wl(decimal s){sb.Append(s).Append(Environment.NewLine);} public void Wl(char s){sb.Append(s).Append(Environment.NewLine);} public void Wl(string s){sb.Append(s).Append(Environment.NewLine);} public void Wl(object s){sb.Append(s).Append(Environment.NewLine);} public void Wl(string f,int s){sb.Append(s.ToString(f)).Append(Environment.NewLine);} public void Wl(string f,long s){sb.Append(s.ToString(f)).Append(Environment.NewLine);} public void Wl(string f,double s){sb.Append(s.ToString(f)).Append(Environment.NewLine);} public void Wl(string f,decimal s){sb.Append(s.ToString(f)).Append(Environment.NewLine);} public void Wl(int[] s){sb.Append(string.Join(" ",s)).Append(Environment.NewLine);} public void Wl(long[] s){sb.Append(string.Join(" ",s)).Append(Environment.NewLine);} public void Wl(double[] s){sb.Append(string.Join(" ",s)).Append(Environment.NewLine);} public void Wl(string[] s){sb.Append(string.Join(" ",s)).Append(Environment.NewLine);} public void Wl(object[] s){sb.Append(string.Join(" ",s)).Append(Environment.NewLine);} public void Wl(){sb.Append(Environment.NewLine);} public void Sm(){Console.Write(sb);} public static bool operator==(Pt a,Pt b){return a.sb.ToString()==b.sb.ToString();} public static bool operator!=(Pt a,Pt b){return a.sb.ToString()!=b.sb.ToString();} public override bool Equals(object obj){return false;} public override int GetHashCode(){return 0;} } public class Sc{ [MethodImpl(MethodImplOptions.AggressiveInlining)] protected virtual string Rl(){return Console.ReadLine();} [MethodImpl(MethodImplOptions.AggressiveInlining)] protected virtual string[] Sp(string st){return st.Split();} [MethodImpl(MethodImplOptions.AggressiveInlining)] private T Ct(string s){return (T)Convert.ChangeType(s,typeof(T));} public virtual int I{get{return int.Parse(Rl());}} public virtual long L{get{return long.Parse(Rl());}} public virtual double D{get{return double.Parse(Rl());}} public virtual string S{get{return Rl();}} public int[] Ia{get{return Array.ConvertAll(Sp(Rl()),int.Parse);}} public long[] La{get{return Array.ConvertAll(Sp(Rl()),long.Parse);}} public double[] Da{get{return Array.ConvertAll(Sp(Rl()),double.Parse);}} public string[] Sa{get{return Sp(Rl());}} public object[] Oa{get{return Sp(Rl());}} public int[] Ia2{get{return Array.ConvertAll(Sp("0 "+Rl()+" 0"),int.Parse);}} public int[] Ia3(string a,string b){return Array.ConvertAll(Sp(a+Rl()+b),int.Parse);} public int[] Ia3(int a){return Array.ConvertAll(Sp(Rl()+" "+a.ToString()),int.Parse);} public long[] La2{get{return Array.ConvertAll(Sp("0 "+Rl()+" 0"),long.Parse);}} public long[] La3(string a,string b){return Array.ConvertAll(Sp(a+Rl()+b),long.Parse);} public long[] La3(int a){return Array.ConvertAll(Sp(Rl()+" "+a.ToString()),long.Parse);} public double[] Da2{get{return Array.ConvertAll(Sp("0 "+Rl()+" 0"),double.Parse);}} public double[] Da3(string a,string b){return Array.ConvertAll(Sp(a+Rl()+b),double.Parse);} public T[] Arr(int n,Func f){var a=new T[n];for(int i=0;i(int n,Func f){var a=new T[n];for(int i=0;i(int n,Func f){var a=new T[n];for(int i=0;i(int n,Func f){var a=new T[n];for(int i=0;i(){var s=Sp(Rl());return (Ct(s[0]),Ct(s[1]));} [MethodImpl(MethodImplOptions.AggressiveInlining)] public (T,T,T) Tp3(){var s=Sp(Rl());return (Ct(s[0]),Ct(s[1]),Ct(s[2]));} [MethodImpl(MethodImplOptions.AggressiveInlining)] public (T,T,T,T) Tp4(){var s=Sp(Rl());return (Ct(s[0]),Ct(s[1]),Ct(s[2]),Ct(s[3]));} [MethodImpl(MethodImplOptions.AggressiveInlining)] public (T,T,T,T,T) Tp5(){var s=Sp(Rl());return (Ct(s[0]),Ct(s[1]),Ct(s[2]),Ct(s[3]),Ct(s[4]));} [MethodImpl(MethodImplOptions.AggressiveInlining)] public (T,T,T,T,T,T) Tp6(){var s=Sp(Rl());return (Ct(s[0]),Ct(s[1]),Ct(s[2]),Ct(s[3]),Ct(s[4]),Ct(s[5]));} [MethodImpl(MethodImplOptions.AggressiveInlining)] public (T1,T2) Tp2(){var s=Sp(Rl());return (Ct(s[0]),Ct(s[1]));} [MethodImpl(MethodImplOptions.AggressiveInlining)] public (T1,T1,T2) Tp3(){var s=Sp(Rl());return (Ct(s[0]),Ct(s[1]),Ct(s[2]));} } public class Scr:Sc{ private List li=new List(); private int l=0; private bool bo=false; [MethodImpl(MethodImplOptions.AggressiveInlining)] protected override string Rl(){ if(bo){return li[l++%li.Count];} li.Add(Console.ReadLine()); return li[li.Count-1]; } public void Again(){bo=true;} } public class Sc2:Sc{ private string[] sps=new string[]{" "," ","\t"}; [MethodImpl(MethodImplOptions.AggressiveInlining)] protected override string[] Sp(string st){return st.Split(sps,StringSplitOptions.RemoveEmptyEntries);} public override int I{get{return int.Parse(Sp(Rl())[0]);}} public override long L{get{return long.Parse(Sp(Rl())[0]);}} public override double D{get{return double.Parse(Sp(Rl())[0]);}} public override string S{get{return Sp(Rl())[0];}} } public class Sct:Sc{ private List li=new List(); private int l=0; public void Add(int s){li.Add(s.ToString());} public void Add(long s){li.Add(s.ToString());} public void Add(double s){li.Add(s.ToString());} public void Add(string s){li.Add(s.ToString());} public void Add(object s){li.Add(s.ToString());} public void Add(int[] s){li.Add(string.Join(" ",s));} public void Add(long[] s){li.Add(string.Join(" ",s));} public void Add(double[] s){li.Add(string.Join(" ",s));} public void Add(string[] s){li.Add(string.Join(" ",s));} public void Add(object[] s){li.Add(string.Join(" ",s));} protected override string Rl(){return li[l++];} public void Clear(){li.Clear();l=0;} public void Again(){l=0;} public void Pf(){Console.WriteLine(string.Join("\n",li));} }