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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;
}
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