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 in = new Scanner(System.in);
        int a = in.nextInt();
        int b = in.nextInt();
        long t = in.nextLong();
        BigInteger t2 = BigInteger.valueOf(t);
        //BigInteger a2 = BigInteger.valueOf(a);
        //BigInteger b2 = BigInteger.valueOf(b);
        int ff = (a+b)/2;
        BigDecimal b1 = BigDecimal.valueOf(ff);
        double mod = Math.pow(10,9) + 7;
        BigDecimal b2 = BigDecimal.valueOf(mod);
        BigInteger b22 = b2.toBigInteger();
        BigInteger b11 = b1.toBigInteger();
        
        BigInteger b3;
        b3 = b11.modPow(t2,b22);
        System.out.println(b3);
        
        
    }
}