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#include <iostream>
using namespace std;
int main()
{
int t,n,i,a=1,b=0,j=1,o =0 ;
cin >> t;
for (i = 0; i < t; i++)
{
cin >> n;
cout << (n - 1) / 2 << "\n";
}
}
#include <iostream>
using namespace std;
int main()
{
int t,n,i,a=1,b=0,j=1,o =0 ;
cin >> t;
for (i = 0; i < t; i++)
{
cin >> n;
cout << (n - 1) / 2 << "\n";
}
}