#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

char*mmap();
#define RD(v) int v=0;{int _c;while(_c=*rp++-48,_c>=0)v=v*10+_c;}

#define WTHI(v) {long _z=v,_n=0,_d=0;while(++_n,_d=_d<<8|0x30|_z%10,_z/=10);*(long*)wp=_d;wp+=_n;}
#define WTLO(v) {long _z=v,_n=8,_d=0;while(_d=_d<<8|0x30|_z%10,_z/=10,--_n);*(long*)wp=_d;wp+=8;}
#define WT(v) if(v>=100000000){WTHI(v/100000000);WTLO(v);}else{WTHI(v);}

int d[1000001];

main(){
	char buf[64];
	read(0,buf,sizeof buf);
	char*rp=buf;
	RD(n);
	RD(m);
	if(n==1||n>m){
		write(1,"1",1);
		_exit(0);
	}
	for(int i=0;i<n;++i){
		d[i]=1;
	}
	int x;
	for(int i=n;i<=m;++i){
		x=d[i-1]+d[i-n];
		x-=x<998244353?0:998244353;
		d[i]=x;
	}
	char*wp=buf;
	WT(x);
	write(1,buf,wp-buf);
	_exit(0);
}