def power(x,y):
	if y == 0 :
		return 1
	elif y ==1:
		return x
	elif y == -1:
		return 1/float(x)
	elif y%2 ==0:
		tmp = power(x,y//2)
		return (tmp*tmp)%(10**9+7)
	else:
		tmp = power(x,y//2)
		if y > 0 :
			return (x*tmp*tmp)%(10**9+7)
		elif y == -3:
			return ((tmp)/float(x))%(10**9+7)
		else :
			return (tmp*tmp /float(x))%(10**9+7)


a = raw_input().split()
a = map(int, a)
x=(a[0]+a[1])/2
t=a[2]
ans=power(x,t)
print ans%(10**9+7)