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#include <iostream>

using namespace std;

int main()
{
    int a,b,c[100000],d=0;
    cin >> a;
    for(int i=0; i<a;i++){
        cin >> b;
        if(b%2==0){
            d = ceil((b/2)-1);
        }
        else{
            d = ceil(b/2);
        }
        c[i]=d;
    }
    for(int i=0; i<a;i++){
        cout << c[i] << endl;
    }
}