;
import java.util.Scanner;
/**
* 蟠桃记
*
*/
public class Main{
public static void main(String[] args) {
Scanner in=new Scanner(System.in);
while(in.hasNext()) {
int n=in.nextInt();
int sum=1;
for(int i=1;i<n;i++) {
sum=(sum+1)*2;
}
System.out.println(sum);
}
}
}
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