#include <iostream>
#include <fstream>

using namespace std;

ifstream fin("roboti.in");
ofstream fout("roboti.out");

int A,B;

int main()
{
    int sum=1,p=1;;
    fin>>A>>B;
    if(B==0)
        fout<<sum;
    else{
        for(int i=1;i<=B;i++)
            p=p*A,sum+=p;
    }
    fout<<sum;
    fin.close();
    fout.close();
    return 0;
}