import java.util.Scanner;
public class PeachProblem {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int n = scanner.nextInt();
int peaches = findInitialPeaches(n);
System.out.println(peaches);
}
public static int findInitialPeaches(int days) {
if (days == 1) {
return 1; // 第一天剩下一个桃子
} else {
// 递归调用,计算前一天剩下的桃子数量
return (findInitialPeaches(days - 1) + 1) * 2;
}
}
}