#include <stdio.h>
#include <string>
#include <cstring>
#include <stdlib.h>
#include <math.h>
#include <algorithm>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <list>
#include <iterator>
#include <assert.h>
#pragma warning(disable:4996) 
 
typedef long long ll;
#define MIN(a, b) ((a)>(b)? (b): (a))
#define MAX(a, b) ((a)<(b)? (b): (a))
#define LINF 9223300000000000000
#define INF 2140000000
const long long MOD = 1000000007;
using namespace std;


int main(int argc, char* argv[])
{
    int n, p;
    scanf("%d%d", &n, &p);
    assert(p>=2);

    vector<ll> a(n+1);
    ll ans=0, sum=0;
    int i;
    for(i=1; i<=n; i++) {
        if(i==1) a[i]=0;
        else if(i==2) a[i]=1;
        else a[i]=(a[i-2]+p*a[i-1])%MOD;

        sum=(sum+a[i])%MOD;
        ans=(ans+sum*a[i])%MOD;
    }
    printf("%lld\n", ans);

    return 0;
}