#include <iostream>

using namespace std;
int liczba_testow, ciast_w_pud, pudelka, suma = 0, obzartuchy, czas[100000];


int main()
{
    cin>>liczba_testow;
    for (int i=1; i<=liczba_testow; i++)
    {
        pudelka =0;
        cin>>obzartuchy>>ciast_w_pud;
        for (int i=0; i<obzartuchy; i++)
        {
            cin>>czas[i];
            suma += 24*3600/czas[i];
        }
        while (pudelka*ciast_w_pud<suma)
        {
            pudelka++;
        }


    cout<<pudelka<<endl;

    }
    return 0;
}

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