#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<int> v;
typedef pair<int,int>p;
#define ll long long
#define fr(i,a,b) for(int i=a;i<b;i++)
#define fre(i,a,b) for(int i=a;i<=b;i++)
#define FOR(i,a,b) for(int i=a;i>b;--i)
#define FORE(i,a,b) for(int i=a;i>=b;--i)
#define f first
#define s second
#define pb push_back
#define mp make_pair
#define lb lower_bound
#define ub upper_bound

int main()
{
ios::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
ll int n,sum=0,b=1;
cin>>n;
fre(i,1,n){b*=2;sum+=b;}
cout<<sum<<endl;







}