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();
        
        int factor = (a+b)/2;
        BigInteger res = BigInteger.valueOf(factor).modPow(t, new BigInteger("1000000007"));
        System.out.print(res);
    }
}