mod = 10**9 + 7
A,B = map(int,input().split())
N0 = 2*(A//2) + 1
N1 = 2*(A - A//2)
N0 %= mod
N1 %= mod

if B%2 == 1:
    ans = N1*(B+1) + N0*B
else:
    ans = N0*(B+1) + N1*B
print(ans%mod)