poj 1277 Beer Land

#include<iostream>using namespace std;int main(){    int n;    cin>>n;    while(n--)    {        int m;        cin>>m;        if(m<=3) cout<<0<<endl;        else        { if(m%2==0) cout<<((m-3)*2+(m-4)*(m-2))/2 <<endl; else cout<<m*(m-3)/2<<endl;        }    }}