def powfast(x,n):
	if(n==0):
		return 1
	elif(n==1):
		return x%1000000007
	elif(n%2==0):
		temp = (powfast(x,n/2)%1000000007)
		return (temp*temp)%1000000007
	else:
		temp = (powfast(x,n/2)%1000000007)
		return ((x%1000000007)*temp*temp)%1000000007
a,b,t = [int(x) for x in raw_input().strip().split()]
print powfast((a+b)/2,t)