解题思路:
注意事项:
参考代码:
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
while(sc.hasNext()) {
int n = sc.nextInt();
int s = 1;
for (int i = 0; i < n-1; i++) {
s=2*(s+1);
}
System.out.println(s);
}
}
}
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