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

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 scanner = new Scanner(System.in);
        int a, b;
        long t;
        a = scanner.nextInt();
        b = scanner.nextInt();
        t = scanner.nextLong();
        scanner.close();
        
        int factor = (a + b) / 2;
        System.out.println(powerFunction(factor, t));
    }
    
    public static long powerFunction (int base, long power) {
        if (power == 1)
            return (long)base;
        long res = powerFunction(base, power / 2);
        if (power % 2 == 1 ) {
            res *= res;
            res %= 1000000007L;
            res *= (long)base;
            res %= 1000000007L;
            return res;
        } else {
            res *= res;
            res %= 1000000007L;
            return res;
        }
    }
}