MOD = 10**9 + 7

A, B = map(int, input().split())

s = 1 if (A % 2) == (B % 2) else 0

a = A % MOD
b = B % MOD

term1 = (2 * a) % MOD
term1 = (term1 * b) % MOD
term2 = a % MOD
term3 = b % MOD

total = (term1 + term2 + term3 + s) % MOD

print(total)