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

// This file is a "Hello, world!" in Java language by OpenJDK for wandbox.

class Main
{
	public static void main(String[] args)
	{
		new Main().run();
	}
	
	final long m=(long)1e9+7;
	
	void run(){
		Scanner sc=new Scanner(System.in);
		int N=sc.nextInt();
		long p=sc.nextLong();
		long[] a=new long[(int)(3e6)];
		long[] s=new long[(int)(3e6)];
		a[1]=0;
		a[2]=1;
		for(int i=3;i<a.length;++i)a[i]=(p*a[i-1]%m+a[i-2])%m;
		for(int i=1;i<a.length;++i)s[i]=(s[i-1]+a[i])%m;
		long ans=0;
		for(int i=1;i<=N;++i){
			ans=(ans+s[i]*a[i]%m)%m;
		}
		System.out.println(ans);
	}
	
	void tr(Object...o){System.out.println(Arrays.deepToString(o));}
}
// OpenJDK reference:
//   http://openjdk.java.net/

// Java language references:
//   http://docs.oracle.com/javase