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

public class Solution {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int i=(a+b)/2;
        BigInteger t = sc.nextBigInteger();
        BigInteger base = BigInteger.valueOf(i);
        long j=1000000007;
        BigInteger mod = BigInteger.valueOf(j);
        BigInteger res = base.modPow(t, mod);
        System.out.println(res);
    }
}