MOD = (10**9 + 7)

def power(x, y):
    if y == 0:
        return 1
    tmp = power(x, y//2) % MOD
    if y % 2 == 0:
        return tmp*tmp
    else:
        return (x % MOD)*tmp*tmp

s = input().split()
a, b, t = int(s[0]), int(s[1]), int(s[2])

p = power((a+b)//2, t)
print((p) % MOD)