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

#define rd(v) long v=0;{int _c;while(_c=*rp++-48,_c>=0)v=v*10+_c;}
#define wt(v) {long _z=v;do*--wp=_z%10+48;while(_z/=10);}
#define rep(v,e) for(long v=0;v<e;++v)

#define SIEVE_N 500002
int sieve[SIEVE_N];
void mksieve(){
	for(long i=2;i<SIEVE_N;++i){
		if(sieve[i]==0){
			for(long j=i*i;j<SIEVE_N;j+=i){
				if(sieve[j]==0){
					sieve[j]=i;
				}
			}
		}
	}
}

#define MD 998244353

int pwmemo[SIEVE_N];

main(){
	mksieve();

	char rwbuf[64];
	read(0,rwbuf,sizeof rwbuf);
	char*rp=rwbuf;
	rd(n);
	rd(m);

	long e=n%(MD-1);
	long a=0,r=0;
	rep(d,m+1){
		a+=r;
		if(sieve[d]){
			r=(long)pwmemo[sieve[d]]*(long)pwmemo[d/sieve[d]]%MD;
		}else{
			r=1;
			long n=e,b=d;
			while(n){
				if(n&1){
					r=r*b%MD;
				}
				n>>=1;
				b=b*b%MD;
			}
		}
		pwmemo[d]=r;
	}
	a=r*(m-1)%MD*(MD+1>>1)%MD-a%MD;
	a=a*(n%MD)%MD*(m+1)%MD;
	a+=a<0?MD:0;

	char*wp=rwbuf+sizeof rwbuf;
	wt(a);
	write(1,wp,rwbuf+sizeof rwbuf-wp);
	_exit(0);
}