#include <stdio.h>
#include <vector>
#pragma warning(disable:4996) 

typedef long long ll;
const long long MOD = 1000000007;
using namespace std;

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

    ll sum1=0, sum2=0;
    vector<ll> a(n+1);
    int i;
    for(i=1; i<=n; i++) {
        if(i==1) a[i]=0;
        else if(i==2) a[i]=1;
        else a[i]=(p*a[i-1]+a[i-2])%MOD;

        sum1=(sum1+a[i])%MOD;
        sum2=(sum2+a[i]*a[i])%MOD;
    }

    ll ans = (sum1*sum1 + sum2)%MOD;
    ans = (ans%2==0? ans/2: (ans+MOD)/2);
    printf("%lld\n", ans);

    return 0;
}