MOD = 10**9+7
A,B = map(int,input().split())
if A%2==0:
    ans = A+1
    ans = (ans+2*((A+1)*(B//2)+A*(B-B//2)))%MOD
else:
    ans = A
    ans = (ans+2*(A*(B//2)+(A+1)*(B-B//2)))%MOD
print(ans)