#include <bits/stdc++.h>
#define ll long long int
#define ld long double
#define pb push_back
#define mod 1000000007

using namespace std;

void solve()
{
    ll a, b, sum = 0, m, x, i, n;
    cin>> a >> b;
    x = min(a, b);
    for(i=1; i<=x; i++)
    {
        m = a-i+1;
        n = b-i+1;
        sum+=(m*n);
    }
    cout<< sum << '\n';
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
 
    ll T = 1, cs = 1, i, k=0;
    //cin >> T;
    //sieve();
    //cin.get();

    while(T--)
    {
        //cout<< "Case " << cs++ << ": ";
        solve();
    }
    return 0;
}