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();
        BigInteger t = new BigInteger(in.next());      
        long bs = (long) (a+b)/2;
        BigInteger base = BigInteger.valueOf(bs);
        BigInteger out = myPower(base,t);
        
        System.out.println(out);
        
            
    
    }
    static BigInteger myPower(BigInteger base,BigInteger t) {
        BigInteger temp;
        BigInteger m = new BigInteger("1000000007");
        if( t.compareTo(new BigInteger("0")) == 0) {
            return (new BigInteger("1"));
        }
        temp = myPower(base, t.divide(new BigInteger("2")));
        if (t.remainder(new BigInteger("2")).compareTo(new BigInteger("0")) == 0) {
            return (temp.multiply(temp).remainder(m));
        } else    {
            return (base.multiply(temp).multiply(temp).remainder(m));
        }
    }
}