info = input().split()
a = int(info[0])
b = int(info[1])
t = int(info[2])
m = 10**9 + 7

exp_r = (a+b)/2

t_seq = str(bin(t))[2:][::-1]
r0 = int(exp_r % m)
res = 1
for ch in t_seq:
    if ch == '1':
        res = int((res * r0) % m)
    r0 = int((r0 * r0) % m)
print(int(res))