Poj Solution 1277

http://poj.org/problem?id=1277

/* @author:zeropinzuo */
import java.io.*;
import java.util.*;
import java.math.BigInteger;

public class Main{
 static Scanner cin;
 public static void main(String args[]){
    cin = new Scanner(System.in);
    int num = cin.nextInt();
    for(int i=0;i< num;i++)
      run();
  }

static void run(){
    int p = cin.nextInt();
    //BigInteger n = new BigInteger(new Integer(p));
    BigInteger one = new BigInteger("1");
    BigInteger two = new BigInteger("2");
    BigInteger three = new BigInteger("3");
    BigInteger six = new BigInteger("24");


    if(p<=3)
      System.out.println(0);
    else if(p%2==1)
      System.out.println(p*(p-3)/2);
    else
         System.out.println(p*(p-4)/2+1);
  }

}