/* Programming Competition - Template (Horatiu Lazu) */

import java.io.*;
import java.util.*;
import java.lang.*;
import java.awt.*;
import java.awt.geom.*;
import java.math.*;
import java.text.*;


class ProblemD{
	BufferedReader in;
	StringTokenizer st;
	int MOD = (int)Math.pow(10, 9) + 7;
	
	public static void main (String [] args){
		new ProblemD();
	}
	
	int fast_exp(long base, long exp) {
		long res=1;
		while(exp>0) {
		   if(exp%2==1) res=(res*base)%MOD;
		   base=(base*base)%MOD;
		   exp/=2;
		}
		return (int)res%MOD;
	}

	public ProblemD(){
		try{
			in = new BufferedReader(new InputStreamReader(System.in));
			int a = nextInt();
			int b = nextInt();
			long t = nextLong();
			
			int ans = (fast_exp((a+b)/2, t) % ((int)Math.pow(10, 9)+7));
			//int ans = ((int)(0.5 * 1 * fast_exp(a, t) + (int)(0.5 * 1 * (int)fast_exp(b, t))) % ((int)((int)Math.pow(10, 9) + 7)));
			System.out.println(ans);
			//System.out.println((long)((0.5 * 1 * Math.pow(a, t) + 0.5 * 1 * Math.pow(b, t)) % (Math.pow(10, 9) + 7)));
			
		}
		catch(IOException e){
			System.out.println("IO: General");
		}
	}
	
	String next() throws IOException {
		while (st == null || !st.hasMoreTokens())
	   	 	st = new StringTokenizer(in.readLine().trim());
		return st.nextToken();
	}

	long nextLong() throws IOException {
		return Long.parseLong(next());
	}

	int nextInt() throws IOException {
		return Integer.parseInt(next());
	}

	double nextDouble() throws IOException {
		return Double.parseDouble(next());
	}

	String nextLine() throws IOException {
		return in.readLine().trim();
	}
}