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

def pow_mod(x, y, z):
    "Calculate (x ** y) % z efficiently."
    number = 1
    while y:
        if y & 1:
            number = number * x % z
        y >>= 1
        x = x * x % z
    return number

a, b, t = map(int, raw_input().strip().split(" "))
mean_a_b = int((float(a) + float(b))/2)
c = int(pow(10, 9) + 7)
print int(pow_mod(mean_a_b, t, c))