#include<iostream>
#include<cmath>
#include<iomanip>
using namespace std;
int main()
{
int n;
cin>>n;
cout<<pow(2,(n-1))*2-1;
return 0;
}

#include <iostream>
#include <cmath>
using namespace std;
int main()
{
    int n;
    cin>>n;
    cout<<2*(pow(2,(n-1)))-1;
    return 0;
}

#include <iostream>
#include <cmath>
using namespace std;
int main()
{
int n;
cin>>n;
cout<<2*(pow(2,(n-1)))-1;
return 0;
}