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

#define rd() ({int _v=0,_c;while(_c=*rp++-48,_c>=0)_v=_v*10+_c;_v;})
#define wt(v) ({ulong _z=v;do*--wp=_z%10+48;while(_z/=10);})
#define wt1(v) ({char*wp=buf+sizeof buf;wt(v);write(1,wp,buf+sizeof buf-wp);})

typedef unsigned long ulong;

int main(){
	char buf[64],*rp=buf;
	read(0,buf,sizeof buf);
	ulong n=rd();
	wt1(n*(n-1)%998244353);
	_exit(0);
}