1335A-Candies and Two Sisters.cpp

//https://codeforces.com/problemset/problem/1335/A
#include <bits/stdc++.h>
using namespace std;
void solve(){
    long long n;
    cin>>n;
    cout<<(n-1)/2;
}
int main(){
  ios_base::sync_with_stdio(0);
  cin.tie(0); cout.tie(0);
  int t;
  cin>>t;
  while(t--)
  {
    solve();cout<<endl;
  }
  return 0;
}