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

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 scn=new Scanner(System.in);
        String a=scn.next();
        String b=scn.next();
        String t=scn.next();
        BigInteger tb=new BigInteger(t);
        BigInteger ab=new BigInteger(a);
        BigInteger bb=new BigInteger(b);
        BigInteger bsum=ab.add(bb);
        bsum=bsum.divide(new BigInteger("2"));
        int modv=(int)(Math.pow(10,9))+7;
        BigInteger bc=BigInteger.valueOf(modv);
        bsum=bsum.modPow(tb,bc);
        System.out.print(bsum.mod(BigInteger.valueOf(modv)));
    
    
        
        
    }
  
}