import math


modval = 10 ** 9 + 7


def rounder(x):
    if abs(x - int(x)) < 0.0000001:
        return int(x)
    return x


def power(x, y):
    if y == 0:
        return 1
    else:
        temp = power(x, y / 2) % modval

        if y % 2 == 0:
            return temp * temp % modval
        else:
            return x * temp * temp % modval


a, b, t = map(int, raw_input().strip().split(' '))

retval = int(.5 * (a + b))
print int(power(retval, t))