def yn(hantei, yes='Yes', no='No'): print(yes if hantei else no)
def p(*args): print(*args)
mod=10**9+7
a,b=map(int, input().split())
if b>a:
    a,b=b,a
if a%2==0:
    f=a+1
    ans=f+2*(2*f-1)*(b//2)
    if b%2==1:
        ans+=2*f
else:
    f=a
    ans=f+2*(2*f+1)*(b//2)
    if b%2==1:
        ans+=2*(f+1)
p(ans%mod)