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

public class Solution {
    
    
    public static void virus(int a, int b, int t){
        double c;
        c = Math.pow(0.5,t);
        double sum = 0;
        for (int k=0; k<=t; k++){
            sum = sum + (Math.pow(a,t-k))*(Math.pow(b,k));
        }
        sum = sum*c;
        double finalsum = sum%(Math.pow(10,9)+7);
        long ppp = Math.round(finalsum);
        System.out.println(ppp);
        
    }

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner sc = new Scanner(System.in);
        int a,b;
        int t;
        a = sc.nextInt();
        b = sc.nextInt();
        t = sc.nextInt();
        virus(a,b,t);
    
    }
}