#include<iostream>
using namespace std;
const long mod=1e9+7;
long power(long a,long b){return b?power(a*a%mod,b/2)*(b%2?a:1)%mod:1;}
main()
{
	long N,K;cin>>N>>K;
	long K2=K%mod*((K+1)%mod)%mod*power(2,mod-2)%mod;
	cout<<(power((K%mod+K2)%mod,N)-power(K2,N)+mod)%mod<<endl;
}