#include<bits/stdc++.h>
using namespace std;
void read(int &h){
    char o;
    int x=0,y=1;
    o=getchar_unlocked();
    while(!(o<='9'&&o>='0')){
        if(o=='-'){
            y=-1;
        }
        o=getchar_unlocked();
    }
    while(o<='9'&&o>='0'){
        x*=10;
        x+=o-'0';
        o=getchar_unlocked();
    }
    h=x*y;
    return ;
}
int n;
int ans=1;
int main(){
    ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    read(n);
    for(int i=1;i<n;i++){
        ans+=1;
        ans*=2;
    }
    cout<<ans;
    return 0;
}