#include <cstdio>
#include <iostream>

#define mod 998244353ll

using namespace std;

inline long long read(){
	int op=1,aa=0;
	char c=getchar();
	while(c<'0'||c>'9'){if(c=='-')op=-1;c=getchar();}
	while(c>='0'&&c<='9'){aa=aa*10+c-'0';c=getchar();}
	return op*aa;
}

long long n,m;

inline long long gcd(long long x,long long y){
	while(y){
		long long t=x%y;
		x=y;
		y=t;
	}
	return x;
}

int main(){
	freopen("hoip.in","r",stdin);
	freopen("hoip.out","w",stdout);
	n=read(),m=read();
//	/*
	long long ans=0;
	for(long long i=2;i<=n;i++){
		for(long long j=i+1;j<=m;j++){
			ans+=gcd(i,j)%mod;
			ans%=mod;
		}
	}
	ans*=2ll;
	ans+=m+n;
//	*/
	/*
	int ans=m+n;
	if(m>n)swap(m,n);//令n>m 
	for(int i=2;i<=n;i++){
		ans+=i;
	}
	*/
	cout<<ans<<'\n';
	return 0;
}