a, b = map(int, input().split())
p = 10 ** 9 + 7
kari = (a - b) % 2
a = a % p
b = b % p
ans = 0
if kari == 0:
    ans = (((a+1) * (b+1)) % p + (a * b) % p) % p
else:
    ans = (((a+1) * b) % p + (a * (b+1)) % p) % p
print("{}".format(ans))