MOD = 10 ** 9 + 7
a, b = map(int, input().split())
if a == 0:
    print(1)
elif b == 0:
    print((a + (a + 1) % 2) % MOD)
else:
    if a % 2 == b % 2:
        print((2 * a * b + (a + b) + 1) % MOD)
    else:
        print((2 * a * b + (a + b)) % MOD)