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

/// complete sliding window and two pointer

///A. Codeforces Checking

int main()
{
    long long t;
    cin >> t;
    while(t--){
        long long int n;
        int cnt=0;
        cin >> n;
        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;
}