# Enter your code here. Read input from STDIN. Print output to STDOUT
a, b, t = map(int, raw_input().strip().split())

x = (a + b)//2
m = 10**9 + 7

x_m = x % m
p = 1
while t > 0:
    if t % 2:
        p *= x_m
        p = p % m
    t /= 2
    x_m = (x_m * x_m) % m

print p