#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
unsigned sieve[SIEVE_N/2+1][2];
void mksieve(){
	for(long i=3;i*i<SIEVE_N;i+=2){
		if(sieve[i>>1][0]==0){
			long k=i;
			for(long j=i*i>>1;j<SIEVE_N/2;j+=i){
				sieve[j][0]=i;
				sieve[j][1]=k;
				k+=2;
			}
		}
	}
}

#define MD 998244353

unsigned pwmemo[SIEVE_N];

long pw(long a,long n){
	unsigned long r;
	if(!(a&1)&&a!=2){
		r=(unsigned long)pwmemo[2]*(unsigned long)pwmemo[a>>1]%MD;
	}else if(sieve[a>>1][0]){
		r=(unsigned long)pwmemo[sieve[a>>1][0]]*(unsigned long)pwmemo[sieve[a>>1][1]]%MD;
	}else{
		r=1;
		unsigned long b=a;
		while(n){
			if(n&1){
				r=r*b%MD;
			}
			n>>=1;
			b=b*b%MD;
		}
	}
	pwmemo[a]=r;
	return r;
}

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;
	rep(d,m){
		a=a+pw(d,e);
	}
	a=pw(m,e)*(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);
}