Scanner sc = new Scanner(System.in)

int a = sc.nextInt()
int b = sc.nextInt()
long t = sc.nextLong()

// v_(i+1) = 0.5*v_i*(a+b)

BigInteger result;
//if((a+b)%2 == 0){
    int m = (a+b)/2
    result = m
    result = result.modPow(t, ((10**9)+7))
//} else{
//    throw new Exception("it is guaranteed that expected value is integer");
//}

println result