#include <bits/stdc++.h>
using namespace std;
#define int long long
const int p = 1e9+7;
int n,m;

int qmul(int a,int b)
{
    int res=0;
    while(b)
    {
        if(b&1)res=(res+a)%p;
        a=(a+a)%p;
        b>>=1;
    }
    return res;
}
signed main() 
{
    cin>>n>>m;
//  int sum=(1+m)*m/2*n+(1+n)*n/2*m;
    int sum1 = (m%2)?qmul(m,(1+m)/2):qmul(1+m,m/2);
    sum1 = qmul(sum1,n);
    int sum2 = (n%2)?qmul(n,(1+n)/2):qmul(1+n,n/2);
    sum2 = qmul(sum2,m);
    cout<<(sum1+sum2)%p;//<<" "<<sum%p;
    return 0;
}