/*** author: yuji9511 ***/
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using lpair = pair<ll, ll>;
const ll MOD = 1e9+7;
const ll INF = 1e18;
#define rep(i,m,n) for(ll i=(m);i<(n);i++)
#define rrep(i,m,n) for(ll i=(m);i>=(n);i--)
#define printa(x,n) for(ll i=0;i<n;i++){cout<<(x[i])<<" \n"[i==n-1];};
void print() {}
template <class H,class... T>
void print(H&& h, T&&... t){cout<<h<<" \n"[sizeof...(t)==0];print(forward<T>(t)...);}
ll dp[1000010][2] = {};

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    ll P,K;
    cin >> P >> K;
    dp[0][0] = 1;
    rep(i,0,K){
        dp[i+1][0] = dp[i][0] * (P+1) % MOD + dp[i][1] * 2 * (P-1);
        dp[i+1][0] %= MOD;
        dp[i+1][1] = dp[i][0] + (P-1) * 2 * dp[i][1];
        dp[i+1][1] %= MOD;
    }
    ll ans = dp[K][0];
    print(ans);
}