# Enter your code here. Read input from STDIN. Print output to STDOUT
import math

r = map(int, raw_input().strip().split(' '))
a, b, t = [r[0], r[1], r[2]]

q = 0.5 * (a + b)
p = int(pow(10, 9) + 7)


print pow(int(q), t, p)