#include <bits/stdc++.h>
using namespace std;

/// complete sliding window and two pointer

///A. Codeforces Checking

int main()
{
    long long t,n;
    cin >> t;
    while(t--){
       cin >> n;
       int cnt=0;
       for(int i=0; i<n; i++){
        for(int j=1; j<n; j++)
        {

            if(i<j && j<n && i+j==n){
                cnt++;
            }
        }

       }
        cout << cnt << endl;

    }



    return 0;
}