http://codeforces.com/contest/1066/submission/46841921

#include<iostream>
#include<cstring>
#include<cstdio>
#include<algorithm>
#include<vector>
#include<set>
#include<map>
#include<queue>
#include<cmath>
#define ll long long
#define mod 998244353
#define inf 0x3f3f3f3f
using namespace std;
#define ll long long

int main()
{
    int t;
    scanf("%d",&t);
    while(t --)
    {
        int L, v, l, r;
        cin>>L>>v>>l>>r;
        int ans = 0;
        ans += L / v;
        ans -= r / v;
        ans += (l - 1) / v;
        cout<<ans<<endl;
    }
    return 0;
}