#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> l_l;
typedef pair<int, int> i_i;
template<class T>
inline bool chmax(T &a, T b) {
    if(a < b) {
        a = b;
        return true;
    }
    return false;
}

template<class T>
inline bool chmin(T &a, T b) {
    if(a > b) {
        a = b;
        return true;
    }
    return false;
}

#define EPS (1e-7)
#define INF (1e9)
#define PI (acos(-1))
const ll mod = 1000000007;
ll a[2010000];

int main() {
    //cout.precision(10);
    cin.tie(0);
    ios::sync_with_stdio(false);
    ll N, p;
    cin >> N >> p;
    a[1] = 0;
    a[2] = 1;
    for(int i = 3; i <= N; i++) {
        a[i] = p * a[i-1] + a[i-2];
        a[i] %= mod;
    }
    ll asum = 0;
    ll asquaresum = 0;
    for(int i = 1; i <= N; i++) {
        asum += a[i];
        asquaresum += a[i] * a[i];
        asum %= mod;
        asquaresum %= mod;
    }
    ll ans = asum * asum % mod;
    ans += asquaresum;
    ans %= mod;
    ans *= 5e8 + 4;
    ans %= mod;
    cout << ans << endl;
    return 0;
}