#include <bits/stdc++.h>

#define M_PI       3.14159265358979323846   // pi

using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef vector<ll> VI;
typedef pair<ll, ll> P;
typedef tuple<ll, ll, ll> t3;
typedef tuple<ll, ll, ll, ll> t4;

#define rep(a,n) for(ll a = 0;a < n;a++)
#define repi(a,b,n) for(ll a = b;a < n;a++)

#include <bits/stdc++.h>
using namespace std;

const ll mod = 1e9 + 7;

const ll INF = 1e15;

int main() {
	ll p, k;
	cin >> p >> k;
	vector<ll> as;
	vector<ll> bs;
	as.reserve(k + 1);
	bs.reserve(k + 1);
	as.push_back(1);
	bs.push_back(0);
	rep(i, k) {
		auto a = (p + 1) * as.back() + 2 * (p - 1) * bs.back();
		a %= mod;
		auto b = as.back() + 2 * (p - 1) * bs.back();
		b %= mod;
		as.push_back(a);
		bs.push_back(b);
	}
	cout << as.back() << endl;
	return 0;
}