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

public class Solution {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
         BigInteger t = sc.nextBigInteger();
	        BigInteger c =  new BigInteger(""+((int)(0.5*(a+b))));
	        
	        BigInteger finalcount;
	        finalcount =  c.modPow(t, new BigInteger("1000000007"));
	        
	        System.out.print(finalcount);
        
    }
}