include <bits/stdc++.h>

using namespace std; using ll = long long;

define pb push_back()

define all(x) x.begin(), x.end()

int main() { ios::sync_with_stdio(0); cin.tie(0);

int t;
cin >> t;
while(t--) {
    ll d, v, l, r;
    cin >> d >> v >> l >> r;
    vector<ll> a;
    for(ll i = 1; i <= d / v; i++) {
       a.pb(v * i);
    }
    ll sum = 0;
    for(ll i = 0; i < a.size(); i++) {
       if(a[i] < l || a[i] > r) {
         sum++;
       }
    }
    cout << sum << "\n";
}

}