#include<iostream>
#include<stdio.h>
using namespace std;
int main()
{
int N;
cin>>N;
int peach=1;
while(--N){
peach = peach+1;
peach = peach*2;
}
cout<<peach;
return 0;
}
#include<iostream>
#include<stdio.h>
using namespace std;
int main()
{
int N;
cin>>N;
int peach=1;
while(--N){
peach = peach+1;
peach = peach*2;
}
cout<<peach;
return 0;
}