#include <stdio.h>

int main () {
  int n = 0;
  long long h = 0LL;
  long long w = 0LL;
  
  int res = 0;
  
  long long ans = 0LL;
  long long mod_num = 998244353LL;
  
  res = scanf("%lld", &h);
  res = scanf("%lld", &w);
  
  ans = ((h/2LL)*(h/2LL))%mod_num;
  ans *= ((w/2LL)*(w/2LL))%mod_num;
  ans %= mod_num;
  ans += mod_num-((h/2LL)*(w/2LL))%mod_num;
  ans *= 4LL;
  ans %= mod_num;
  
  if (w%2LL == 1LL) {
    long long tmp = ((h/2LL)*(h/2LL))%mod_num;
    tmp *= w;
    tmp %= mod_num;
    tmp += mod_num-((h/2LL)%mod_num);
    ans += tmp*2LL;
  }
  
  if (h%2LL == 1LL) {
    long long tmp = ((w/2LL)*(w/2LL))%mod_num;
    tmp *= h;
    tmp %= mod_num;
    tmp += mod_num-((w/2LL)%mod_num);
    ans += tmp*2LL;
  }
  
  if (h%2LL == 1LL && w%2LL == 1LL) {
    long long tmp = (h*w)%mod_num;
    tmp += mod_num-1LL;
    ans += tmp;
  }
  
  printf("%lld\n", ans%mod_num);
  return 0;
}