import java.math.BigInteger;
import java.util.Scanner;

public class D {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int a = in.nextInt();
		int b = in.nextInt();
		long t = in.nextLong();
        BigInteger res = BigInteger.valueOf( (a + b) / 2 ).modPow( BigInteger.valueOf(t), BigInteger.valueOf(1_000_000_007) );
		System.out.println(res);
	}
}