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

public class Solution {

    private static double mutate(double cells, int t, int a, int b) {
        if (t == 0) {
            return cells;
        }
        return 
            mutate(cells * a * 0.5, t - 1, a, b) +
            mutate(cells * b * 0.5, t - 1, a, b);
    }
    
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int a = in.nextInt();
        int b = in.nextInt();
        int t = in.nextInt();
        double cells = mutate(1.0d, t, a, b);
        System.out.println(((long)cells) % (long)(Math.pow(10, 9) + 7));
    }
}