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

public class Solution {
    
  /*  long pow (long a, int b)
    {
        if ( b == 0)        return 1;
        if ( b == 1)        return a;
        if ( b & 1 == 0)    return     pow ( a * a, b/2); //even a=(a^2)^b/2
        else                return a * pow ( a * a, b/2); //odd  a=a*(a^2)^b/2

    }*/
    
    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);
        int a = sc.nextInt();
        int b = sc.nextInt();
        BigInteger t = sc.nextBigInteger();
        
        BigInteger tmp = new BigDecimal((0.5*(a+b))).toBigInteger();
        BigInteger m = new BigInteger("1000000007");
        BigInteger result = tmp.modPow(t,m);
       // int result = (int)Math.pow((0.5*(a+b)),t);
        //result = result % 1000000007;
        System.out.println(result);
        
    }
}