import sys
input = lambda : sys.stdin.readline().rstrip()
sys.setrecursionlimit(max(1000, 10**9))
write = lambda x: sys.stdout.write(x+"\n")

h,w = list(map(int, input().split()))
m = min(h,w)
f = [None]*(m+1)
M = 10**9+7
def subh(k):
    num = h//k
    return h*num - (k + num*k)*num//2
def subw(k):
    num = w//k
    return w*num - (k + num*k)*num//2
for k in range(m, 0, -1):
    f[k] = subh(k)*subw(k)
    for i in range(2*k, m+1, k):
        f[k] -= f[i]
        f[k] %= M
    f[k] %= M
ans = (f[1]*2 + (h-1)*w + h*(w-1))%M
print(ans%M)