#include <iostream>
#include <vector>
#include <set>
#define llint long long
#define mod 1000000007

using namespace std;

llint n;
llint p;
llint a[2000005], sum[2000005];

int main(void)
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	
	cin >> n >> p;
	a[2] = 1, sum[2] = 1;
	for(int i = 3; i <= n; i++){
		a[i] = p*a[i-1]%mod + a[i-2], a[i] %= mod;
		sum[i] = sum[i-1] + a[i], sum[i] %= mod;
	}
	
	llint ans = 0;
	for(int i = 1; i <= n; i++){
		ans += a[i] * sum[i] % mod, ans %= mod;
	}
	cout << ans << endl;
	
	return 0;
}