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

public class Solution {
BigInteger ans = new BigInteger("1");

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);

		String firstRow = scan.nextLine();
		String[] firstRowSplit = firstRow.split("\\s");
		int growthOfA, growthOfB;
		BigInteger time;

		growthOfA = Integer.parseInt(firstRowSplit[0]);
		growthOfB = Integer.parseInt(firstRowSplit[1]);
		time = new BigInteger(firstRowSplit[2]);
		BigDecimal ans = new BigDecimal(String.valueOf((0.5 * growthOfA) + (0.5 * growthOfB)));
		BigInteger temp = ans.toBigInteger().modPow(time, new BigInteger("1000000007"));
		System.out.println(temp);
	}

}