#include<stdio.h>
#include<iostream>
#include<algorithm>
#include<queue>
#include<string.h>
using namespace std;
typedef long long ll;
const ll M=998244353;
int n,i,j,m;
ll p[5000005],inv[5000005],ans;
ll C(ll n,ll m)
{
	if(n<m)
		return 0;
	return p[n]*inv[m]%M*inv[n-m]%M;
}
ll qpow(ll a,ll b)
{
	ll s=a,ans=1;
	while(b)
	{
		if(b&1)
			ans=ans*s%M;
		s=s*s%M;
		b>>=1;
	}
	return ans;
}
int main()
{
	scanf("%d %d",&n,&m);
	p[0]=p[1]=inv[1]=1;
	for(i=2;i<=m*3+n;i++)
	{
		p[i]=p[i-1]*i%M;
		inv[i]=(M-M/i)*inv[M%i]%M;
	}
	inv[0]=1;
	for(i=2;i<=m*3+n;i++)
		inv[i]=inv[i]*inv[i-1]%M;
	ans=C(m*3+n-1,n-1)-C(m+n-2,n-1)*n%M;
	for(i=m+1;i<=m*3&&i<=n;i++)
		if((m*3-i)%2==0)
			ans=(ans-C(n,i)*C(n+(m*3-i)/2-1,n-1))%M;
	cout<<(ans%M+M)%M;
}
