include

using namespace std;

int main() {

int n;
cin >> n;

int peaches = 1;  // 第n天剩下的桃子数

// 从第n-1天倒推到第1天
for (int day = n; day >= 1; day--) {
    peaches = (peaches + 1) * 2;
}

cout << peaches << endl;
return 0;

}