#inputs
a, b, t = [int(i) for i in input().split()]
avg = int((a+b)/2)
m = (10**9)+7

#generate table
table = [avg]
for i in range(64):
    table.append((table[i]**2)%m)
#[print(i) for i in table]

tb = bin(t)[2:][::-1]
#print(tb)
out = 1
for i in range(len(tb)):
    if tb[i] == '1':
        out = (out*table[i])%m
print(out)