mod = 10 ** 9 + 7
A, B = map(int, input().split())
if A > B:
    A, B = B, A

if A == 0 and B == 0:
    print(1)
    exit()

if A == 0:
    if B % 2 == 0:
        print((B + 1) % mod)
    else:
        print(B % mod)
    exit()

if (A + B) % 2 == 0:
    b = 2 * (A + 1 + B + 1) - 4
    S = 2 * A * B
    ans = S + 1 + b // 2
    print(ans % mod)
else:
    ans = A * (B + 1) + B * (A + 1)
    print(ans % mod)