(자바) 백준베라 패션 #15439

암호

import java.util.Scanner;

public class BOJ_15439 {

    public static void main(String() args) {
        Scanner in = new Scanner(System.in);
        int n =in.nextInt();
        System.out.println(n*(n-1));
        in.close();
    }
}

링크

https://www.acmicpc.net/problem/15439