#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef pair<ll, ll> P;
typedef vector<ll> VI;
typedef vector<VI> VVI;
const ll MOD = 1000000007;
const ll INF = 1e18;
#define REP(i, n) for(int i = 0; i < n; i++)
#define ALL(v) v.begin(), v.end()

ll power(ll x, ll y) {
	if (y==0) return 1;
	else if (y==1) return x%MOD;
	else if (y%2==0) { ll pow=power(x,y/2); return (pow*pow)%MOD; } 
	else { ll pow=power(x,y/2); return ((pow*pow)%MOD)*x%MOD; }
}
ll divid(ll x, ll y) {
	return ((x%MOD)*power(y,MOD-2))%MOD;
}

int main(){
	ll n, k; cin >> n >> k;
	ll ans=1;
	k%=MOD;
	ll kk=k;
	kk%=MOD;
	kk*=(kk+1);
	kk%=MOD;
	kk=divid(kk,2);
	REP(i,n){
		ans=(ans*kk)%MOD+(ans*k)%MOD;
		ans%=MOD;
	}
	ll m=1;
	REP(i,n){
		m=(m*kk)%MOD;
	}
	ans-=m;
	ans+=MOD;
	ans%=MOD;
	cout << ans << endl;
	return 0;
}