代码:
1 import java.util.*;
2 public class Main {
3 public static void main (String [] args) {
4 Scanner cin=new Scanner(System.in);
5 int n=cin.nextInt();
6 int num=0;
7 for(int b=1;b<=n;b++) {
8 for(int s=0;s<=n;s++) {
9 for(int g=0;g<=n;g++) {
10 if(b!=s&&b!=g&&s!=g) {
11 num++;
12 }
13 }
14 }
15 }
16 System.out.println(num);
17 }
18 }