import sys
import math

inputs = [int(tmp) for tmp in input().strip().split(' ')]
a = inputs[0]
b = inputs[1]
t = inputs[2]

mod = 1000000007

def mod_pow(x, y, mod):
	ans = 1

	while y:
		if y & 1:
			ans = ans * x % mod

		y >>= 1
		x = x * x % mod

	return ans

print(mod_pow(int((a + b) / 2), t, mod))