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

public class Solution {

    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
		int a=sc.nextInt();
		int b=sc.nextInt();
		BigInteger total=new BigInteger("1");
		BigInteger modulo=new BigInteger("1000000007");
		BigInteger time=sc.nextBigInteger();
		double sum=0;
		int tot=0;
		BigInteger numberOfCells;
		sum=0.5 *(a+b);
		tot=(int)sum;
		
		total=BigInteger.valueOf(tot);
		
		numberOfCells=total.modPow(time,modulo);
		
		System.out.println(numberOfCells);

        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
    }
}