x,y = map(int,input().split())
a = max(x,y)
b = min(x,y)
l = 1000000007
if (a-b)%2==0:
    target1 = ((2*b+1)%l)*((a-b+1)%l)%l
    target2 = ((b%l)**2)%l*2
    ans = (target1+target2)%l
else:
    target1 = ((2*b+1)%l)*((a-b)%l)%l
    target2 = ((b%l)*((b+1)%l))%l*2%l
    ans = (target1+target2)%l
print(ans)