import java.util.Scanner;
public class Main {
public static void peach(int N){
int num = 1;//桃子总数,桃子剩余数量
for(int i=0;i<N-1;i++){
num=(num+1)*2;
}
System.out.print(num);
}
public static void main(String[] arg){
Scanner sc = new Scanner(System.in);
int N = sc.nextInt();
peach(N);
}
}
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