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

public class Solution {

     private static final long MOD = 1000000007;

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int a = in.nextInt();
        int b = in.nextInt();
        long t = in.nextLong();

        long n = (a + b) / 2;
        System.out.println(power(n, t));
    }

    static long power(long base, long exponent) {
        if(exponent == 1)
            return base;
        if(exponent % 2 == 0)
            return power(base * base % MOD, exponent / 2);
        else
            return (power(base, exponent - 1) * base) % MOD;
    }
}