a,b,t = [int(i) for i in input().strip().split(' ')]

def modular_power(base, exp, mod):
    res = 1
    base = base%mod
    while exp > 0:
        if exp%2 == 1:
            res = (res * base)%mod
            exp -= 1
        base = (base * base)%mod
        exp = exp//2
        #print(exp, base, res)
    return(res)

mod = pow(10,9) + 7
#mod = 100
base = int(0.5*(a+b))
#res = modular_power(base, t, mod)
res = pow(base,t,int(mod))

print(int(res))
#print(int(pow(0.5*(a+b),t)%mod))