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 in = new Scanner(System.in);
        long a = in.nextLong();
        long b = in.nextLong();
        long t = in.nextLong();
        long prob = power((a+b)/2, t, 1000000007);
        System.out.print(prob);
    }
    
    static long power(long x, long y, long p)
{
    long res = 1;      // Initialize result
 
    x = x % p;  // Update x if it is more than or 
                // equal to p
 
    while (y > 0)
    {
        // If y is odd, multiply x with result
        if (y%2!= 0)
            res = (res*x) % p;
 
        // y must be even now
        y = y/2; // y = y/2
        x = (x*x) % p;  
    }
    return res;
}
    
    
    
    
    
}