#include<bits/stdc++.h>

using namespace std;

/// Typedef
typedef long long ll;

#define sc1(a) scanf("%lld",&a)
#define sc2(a,b) scanf("%lld %lld",&a,&b)

#define pf1(a) printf("%lld\n", a)
#define pf2(a,b) printf("%lld %lld\n",a,b)

int main() {

    //seive();

    ll tc, num, t = 1, choose;

    sc1(num);

    ll ans = pow(2, num + 1) - 2;

    pf1(ans);

    return 0;
}