#include<bits/stdc++.h>
using namespace std;

const int _ = 3e6 + 7 , MOD = 998244353;
int jc[_] , inv[_] , N , M;

int poww(long long a , int b){
	int times = 1;
	while(b){if(b & 1) times = times * a % MOD; a = a * a % MOD; b >>= 1;}
	return times;
}

void init(int mx){
	jc[0] = 1; for(int i = 1 ; i <= mx ; ++i) jc[i] = 1ll * jc[i - 1] * i % MOD;
	inv[mx] = poww(jc[mx] , MOD - 2);
	for(int i = mx - 1 ; i >= 0 ; --i) inv[i] = inv[i + 1] * (i + 1ll) % MOD;
}

int binom(int p , int q){return p < q ? 0 : 1ll * jc[p] * inv[q] % MOD * inv[p - q] % MOD;}

int main(){
	cin >> N >> M; init(3 * M + N); int sum = 0;
	for(int i = 0 ; i <= N && i <= M ; ++i){
		if((3 * M - i) & 1) continue;
		sum = (sum + 1ll * binom(N , i) * binom((3 * M - i) / 2 + N - 1 , N - 1)) % MOD;
	}
	cout << (sum - 1ll * N * binom(M - 1 + N - 1 , N - 1) % MOD + MOD) % MOD; return 0;
}
