import java.io.*;
import java.util.*;
import java.math.*;

public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner sc = new Scanner(System.in);
        BigInteger a = new BigInteger(sc.next());
        BigInteger b = new BigInteger(sc.next());
        BigInteger t = new BigInteger(sc.next());
        Integer m = new Integer(1000000007);
        BigInteger modder = new BigInteger(m.toString());
        
        BigInteger sum = BigInteger.ZERO;
        sum = sum.add(a);
        sum = sum.add(b);
        BigDecimal rational = new BigDecimal(sum);
        rational = rational.divide(new BigDecimal(2));
        BigInteger output = rational.toBigIntegerExact();
        output = output.modPow(t, modder);
        
        System.out.println(output.toString());
        sc.close();
    }
}