using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;
using System.Runtime.Intrinsics.Arm;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var c = NList;
        var (n, p) = (c[0], c[1]);
        if (n == 1) WriteLine(0);
        else if (n == 2) WriteLine(1);
        else
        {
            var sum = 1L;
            var prev1 = 1L;
            var prev2 = 0L;
            var mod = 1_000_000_007;
            var ans = 1L;
            for (var i = 2; i < n; ++i)
            {
                var cur = (p * prev1 + prev2) % mod;
                sum = (sum + cur) % mod;
                ans = (ans + sum * cur) % mod;
                prev2 = prev1;
                prev1 = cur;
            }
            WriteLine(ans);
        }
    }
}