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) {
        /* 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 = sc.nextBigInteger();
        BigInteger b = sc.nextBigInteger();
        BigInteger t = sc.nextBigInteger();
          
        BigInteger bi1, bi2, bi3;

	

        bi1 = a.add(b);
        BigDecimal tmp = new BigDecimal("0.5");
        tmp = tmp.multiply(new BigDecimal(bi1));
        bi1 = tmp.toBigInteger();
      
        bi2 = new BigInteger("1000000007");

       
	    bi3 = bi1.modPow(t, bi2);

       
	System.out.println( bi3+"" );
    }
}