import sys

parameters = [int(height_temp) for height_temp in input().strip().split(' ')]

a = parameters[0]
b = parameters[1]
t = parameters[2]

prob_a = 1
prob_b = 1

for msec in range(0,t):
    prob_a = prob_a * a
    prob_b = prob_b * b

num_cells = (0.5*prob_a + 0.5*prob_b)%(10**9 + 7)
print(int(num_cells))