#include <bits/stdc++.h>
using namespace std;
#define ll __int128
#define ld long double
#define pii pair<int,int>
#define vi vector<int>
#define si set<int>
#define qi queue<int>
#define sti stack<int>
#define fi first
#define se second
#define pb push_back
#define clr(f,n) memset(f,0,sizeof(int)*(n))
#define cpy(f,g,n) memcpy(f,g,sizeof(int)*(n))
ll read(){
    ll ans=0;char ch=getchar();
    while(!isdigit(ch))ch=getchar();
    while(isdigit(ch))ans=(ans<<3)+(ans<<1)+(ch^48),ch=getchar();
    return ans;
}
void write(ll x){
    if (x>9)write(x/10);
    putchar(x%10+'0');
}
int main(){
	freopen ("chessqueen.in","r",stdin);
	freopen ("chessqueen.out","w",stdout);
	ll n=read(),m=read();
	ll ans=n*m*(n+m-2);
	if (n<m)swap(n,m);
	ans+=(n-m+1)*m*(m-1)*2;
	for (ll i=1;i<m;i++){
	    ans+=i*(i-1)*4;
    }
    write(ans);putchar('\n');
    return 0;
}