#include <bits/stdc++.h>
#define rep(i,n) for(int i=(0);i<(n);i++)

using namespace std;

typedef long long ll;

const ll MOD = 1e9 + 7;

// pow
ll pow(ll a, ll b){
	if(b == 0) return 1;
	if(b & 1) {
		return a * pow(a, b - 1);
	} else {
	ll d = pow(a, b / 2);
	return d * d;
	}
}

ll powmod(ll a, ll b){
	if(b == 0) return 1;
	if(b & 1) {
		return a * powmod(a, b - 1) % MOD;
	} else {
		ll d = powmod(a, b / 2) % MOD;
		return d * d % MOD;
	}
}

ll sub(ll a, ll b){
	return a + MOD - b;
}

ll inv(ll a){
	return powmod(a, MOD - 2);
}

int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);

	ll n, p;
	cin >> n >> p;

	ll y = 1;
	ll z = 0;
	ll sm = y + z;
	rep(i, n - 2){
		ll x = p * y + z;
		x %= MOD;
		sm += x;
		sm %= MOD;
		z = y;
		y = x;
	}

	y = 1;
	z = 0;
	ll dg = y * y + z * z;
	rep(i, n - 2){
		ll x = p * y + z;
		x %= MOD;
		dg += x * x;
		dg %= MOD;
		z = y;
		y = x;
	}

	ll ans = dg;
	ll ot = sm * sm;
	ot %= MOD;
	ot += MOD - dg;
	ot %= MOD;
	ot *= inv(2);

	ans += ot;
	ans %= MOD;

	cout << ans << endl;
}