def modpow(base, exp, mod):
    if mod == 1:
        return 0

    res = 1
    base = base % mod
    while exp > 0:
        if exp % 2 == 1:
            res = (res * base) % mod
        exp = exp >> 1
        base = (base * base) % mod
    return res

s = input()
a, b, t = map(int, s.split())

mod = 1000000007
result = modpow(int((a + b)/2), t, mod)

print(int(result))