#ifdef DEBUG
#define _GLIBCXX_DEBUG
#endif
//#pragma GCC optimize("O3")
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;

const ll mod = 1000000007;

#define X first
#define Y second

ll pew(ll a, ll b)
{
    ll res = 1;
    while (b>0)
    {
        if (b&1) res = res*a%mod;
        b >>= 1;
        a = a*a%mod;
    }
}


const ld ee = expl(1);

void solve()
{
    ll n;
    cin >> n;
    if (n<=2)
    {
        cout << 0 << "\n";
        return;
    }
    n -= 2;
    cout << (int)ceil(n/ee) << endl;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
//#ifdef DEBUG
//    freopen("input.txt", "r", stdin);
//#endif
    int T = 1;
    cin >> T;
    while (T--) solve();
    return 0;
}