MOD = 10 ** 9 + 7
fac = [1] * (10 ** 6 + 1)
for i in range(len(fac) - 1):
    fac[i + 1] = fac[i] * (i + 1) % MOD
 
def comb(n, k):
    return fac[n] * pow(fac[n - k] * fac[k], MOD - 2, MOD) % MOD

h, w = map(int, input().split())
ans = 0
for i in range(w):
    t = pow(pow(2, w - i, MOD) - 1, h, MOD) * comb(w, i)
    if i % 2 == 0:
        ans += t
    else:
        ans -= t
print(ans % MOD)