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

public class Solution {

    static long countArray(int n, int k, int x) {
        int val=(int)Math.pow(10,9)+7;
        long sum=(k-2)%val;
        for(int i=2;i<n-1;i++){
            sum+=k-1;
            sum=sum%val;
        }
        return sum%val;
    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int k = in.nextInt();
        int x = in.nextInt();
        long answer = countArray(n, k, x);
        System.out.println(answer);
        in.close();
    }
}