#include <iostream>
using namespace std;
int main() {
    int n,s=1;
    cin>>n;
    for(int i=1;i<=n;i++){
        s=s*2;
    }
    cout<<s-1;
    return 0;
}
/**************************************************************
	Problem: 1223
	User: wengsihan
	Language: C++
	Result: Accepted
	Time:16 ms
	Memory:2072 kb
****************************************************************/