hdoj2013_蟠桃记
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import java.util.Scanner;
import java.lang.Math;
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=0;i<n-1;i++)
sum=(sum+1)*2;
System.out.println(sum);
}
}
}
import java.lang.Math;
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=0;i<n-1;i++)
sum=(sum+1)*2;
System.out.println(sum);
}
}
}